Mineral exploration is the long, uncertain search that comes before every mine. Here is how it works end to end: greenfield versus brownfield, the stages from prospecting to feasibility, the geological, geochemical, geophysical and satellite methods, how results are reported, what drives cost and time, and where to go next for licensing and mapping.
Covers Greenfield ยท Brownfield ยท Stages
Methods Geology ยท Geochem ยท Geophysics ยท Satellite
Audience Explorers, juniors, investors
Mineral exploration is the work of finding concentrations of minerals that could one day be mined at a profit, and then proving how large and rich they are. It runs from the first desk study of a region, through prospecting, mapping, sampling and geophysics, to drilling and the resource estimates that justify a mine. Most projects fail along the way. The few that succeed can take one to two decades to reach production.
Try it: Discovery-to-production timeline check โ
Think of this page as the map of the whole topic, with deeper guides linked as you need them. It runs through the vocabulary (prospecting, exploration, greenfield, brownfield), each stage of a programme, the main methods, the reporting rules that separate an exploration target from a resource, the economics, and the licensing steps. Where satellite analysis can take cost and time out of the earliest, riskiest stages, we say so; where it can’t, we say that too.
“The average mine took 15.7 years to go from discovery to production. Some took 32.”
Mineral exploration is a funnel. Each stage costs more per hectare than the last, so its real job is to eliminate ground as cheaply as possible and concentrate money on the few targets that deserve drilling. The best programmes are judged by how well they say “no” early.
What mineral exploration is, and how it differs from prospecting
The words are often used interchangeably, but they describe different depths of effort. Mineral prospecting is the first search for signs of mineralisation: walking ground, panning streams, looking for gossans, old workings and altered rock, and taking a few samples. Mineral exploration is the broader, systematic process that follows, combining geology, geochemistry, geophysics, remote sensing and drilling to test whether a deposit exists and how big it is.
In practice, “prospecting and exploration” describes one continuum. A prospector’s discovery becomes an exploration project; an exploration company’s regional target is often first checked by prospecting. What changes along the way is scale, cost and the standard of evidence. Early work asks “is anything here?”. Late work asks “how much, how rich, and can it be mined economically?”.
Geology and exploration: the other names for the same work
Search engines, university courses and government agencies use a handful of labels for this work, and it helps to know they overlap. “Geology and mineral exploration” is how many degree programmes and survey departments describe the field. “Exploration and mining geology” names the two professional specialisms: the exploration geologist finds and tests the deposit, the mining geologist manages it once it is in production. Translated regulations often speak of “geological prospecting and exploration”, “mineral prospecting and exploration” or the “prospecting and exploration of mineral deposits”. Some older texts use “mineral investigation” or “ore research and exploration”. The work behind every one of these labels follows the stages described below.
Who does mineral exploration
- โ Major mining companies explore mostly around their existing mines and at advanced projects, where discovery risk is lower.
- โ Junior mining exploration companies are small, often listed firms that raise equity to explore early-stage ground. They make many of the grassroots discoveries and usually sell or joint-venture them.
- Government geological surveys produce regional geological, geochemical and geophysical data that lower the entry cost for everyone.
- Prospectors and small-scale miners find surface showings and hold many of the small licences that later become exploration projects.
Junior mining exploration: how the model works
Much greenfield mineral exploration is carried out by junior companies. Our guide to junior and major gold explorers lists the red flags investors look for. The model is simple to describe and hard to execute. A junior acquires early-stage ground, raises equity to fund a programme, and spends it on mapping, sampling, geophysics and a first round of drilling. Good results let it raise more money at a higher valuation; poor results usually mean dropping the ground and moving on. Successful juniors often sell the project or bring in a larger partner through an option or joint venture before the expensive development stages.
Because each financing buys only a limited amount of work, juniors live or die by how efficiently they turn money into information. That is why low-cost, wide-area tools are so valuable to them: every dollar not spent screening poor ground is a dollar available for drilling the best target.
Budgets are sensitive to metal prices and capital markets. S&P Global Market Intelligence put global nonferrous exploration budgets at about US$12.40 billion in 2025, a small dip on the previous year and the third annual decline in nominal terms. It publishes a new figure each year in its World Exploration Trends report, which is where to look for anything later. Higher gold, copper and silver prices lifted those commodities’ budgets, but not enough to offset falls in lithium, nickel and diamonds.
Before spending on fieldwork, collect every public dataset for your area: survey maps, open-file reports, regional geochemistry, airborne geophysics and satellite imagery. Much of the first stage of mineral exploration can be done at a desk, and it decides where the field budget goes.
Have a licence or an area in mind? Draw it on mining.farmonaut.com (Map Your Mining Site) to start a satellite screen, or read how our satellite-based mineral detection works before your team goes into the field.
Greenfield vs brownfield exploration
The single biggest strategic choice in mineral exploration is where to look relative to known deposits.
- โ Greenfield (grassroots) exploration searches areas with no known deposit or mine. The upside is large (a new district), but so is the risk, and the data are usually thin.
- โ Brownfield exploration searches around known deposits or mines, including extensions along strike or at depth and nearby satellite deposits. Geology is better understood, infrastructure exists, and each discovery can be fed into an existing plant.
- Minesite and near-mine exploration are the most brownfield of all, carried out inside or right next to an operating mine.
Industry money has been moving steadily towards the brownfield end. S&P Global’s World Exploration Trends 2026 put grassroots exploration at US$2.57 billion in 2025, 21% of global budgets and the lowest share in its dataset, while minesite exploration rose to a record US$5.63 billion, or 45%. In its January 2017 report the same shares were 28% and 35%. That lowers near-term risk for companies, but it raises a long-term concern: fewer new districts are being found, and the pipeline of future mines depends on greenfield discoveries made today.
The stages of mineral exploration
Every company labels its stages a little differently, but the sequence is consistent. The table below shows a typical path, the work done at each step and what the step produces. Reporting categories follow the JORC Code, one of the international codes aligned through CRIRSCO.
| Stage | Typical area | Main work | What it produces | Reporting category |
|---|---|---|---|---|
| 1. Target generation | Region or belt | Desk study, public data, satellite screening, mineral systems analysis | Areas worth licensing | None / Exploration Results |
| 2. Reconnaissance | Licence | Prospecting, regional mapping, stream sediments, airborne geophysics | Anomalies and prospects | Exploration Results |
| 3. Prospect definition | Prospect | Detailed mapping, soil and rock sampling, ground geophysics, trenching | Drill targets | Exploration Results; possibly an Exploration Target (ranges only) |
| 4. Discovery drilling | Target | Scout drilling, logging and assaying | Mineralised intersections | Exploration Results |
| 5. Resource drilling | Deposit | Infill drilling, density, QA/QC, geological modelling | Mineral Resource estimate | Inferred โ Indicated โ Measured |
| 6. Studies | Deposit and site | Metallurgy, engineering, environmental and social studies | Scoping, pre-feasibility, feasibility | Ore Reserve (Probable, Proved) |
The first three stages are where most money is saved or wasted. They are also the stages where satellite data does the most good. At stage one, our satellite analysis screens a whole licence or belt for alteration and structure. At stages two and three, it ranks those areas so that mapping and sampling go to the best ground first. By stage four, the field data take over.
Drilling too early. A drill rig is the most expensive tool in mineral exploration, and holes placed on a single soil anomaly or a regional map often miss. Spending first on mapping, sampling and remote sensing usually costs less than one wasted hole.
How long from first target to first production?
How many years will your project need? Nobody can say for one project, but the industry averages give a reality check. S&P Global’s 127-mine study puts discovery to production at 15.7 years on average, anywhere from 6 to 32, and its later analysis puts recent starts at 17.9 years. Add the years you expect to spend before a discovery and compare the answer with the time left on your exploration licence.
Discovery-to-production timeline check
Assumptions: benchmarks from S&P Global Market Intelligence research on discovery-to-production lead times (127 precious and base metal mines that started production 2002 to 2023; mines started 2020 to 23). Averages describe mines that made it; most projects never reach production. Licence renewals, conversion to a mining licence and permitting times vary by country, so check them with the authority. This is a planning check, not a forecast.
With the defaults (a discovery in four years, the 15.7-year average and five years left on the licence) first production lands almost twenty years out, about fifteen years after the exploration licence ends. That gap is why licence renewals, conversion rules and the cost of holding ground belong in the plan from the first month.
Mineral exploration methods
No single method finds a deposit. Explorers combine several, each measuring a different property of the ground, and look for places where the signals agree. The mineral systems approach, developed at Geoscience Australia’s predecessor AGSO, frames this well: a deposit needs a source of metals and fluids, a pathway, and a trap where metals are deposited, and it must be preserved afterwards. Each method helps find one or more of those ingredients.
Geology and geological mapping
Mapping the rocks, structures and alteration at surface is the foundation of all mineral exploration. It identifies host rocks, the faults and shear zones that act as fluid pathways, and the alteration halos that show fluids actually passed through. Scale matters: regional maps find belts, detailed maps find drill targets. Our separate guide to geological mapping methods and map scales covers the fieldwork and standards in depth.
Geochemistry
Geochemistry measures the chemistry of stream sediments, soils, rocks, water or vegetation to find anomalous concentrations of ore and pathfinder elements. Stream sediments cover large catchments cheaply at reconnaissance stage. Soil grids and rock-chip sampling then outline anomalies at prospect scale. The strength of geochemistry is that it measures the metal itself; its weakness is that transported cover can hide or displace the signal.
Geophysics
Geophysical surveys map physical properties of rocks below the surface. Geoscience Australia lists the main tools as gravity, magnetic, radiometric, airborne electromagnetic, magnetotelluric and active and passive seismic methods. Magnetics maps magnetic rocks and structures; gravity maps density contrasts; electromagnetic and electrical methods find conductive bodies such as some sulphides; radiometrics maps potassium, thorium and uranium at the surface. Airborne surveys cover whole districts; ground surveys refine specific targets. We compare each technique, and what it can and cannot detect, in what each geophysical survey method sees.
Remote sensing and satellite analysis
Satellite and airborne sensors measure reflected light across many wavelengths. Many alteration minerals have distinct absorption features in the shortwave infrared, which is why sensors such as ASTER, with six shortwave-infrared bands, have been used to map sericite, kaolinite, chlorite, epidote and carbonates around hydrothermal deposits. Elevation models and lidar map landforms and faults, and USGS lidar work at Lake Tahoe shows it can reveal faults beneath forest canopy. Remote sensing is the fastest way to add information over large, poorly known areas; the sensors, band ratios and their limits are set out in our guide to Landsat, ASTER and Sentinel-2 for geology.
How targets differ by commodity
Ore exploration always starts from a deposit model, and different commodities leave different fingerprints. The same toolkit is used everywhere, but the weight given to each method changes:
- โ Gold: many hard-rock gold deposits are controlled by faults and shear zones, so structural mapping and alteration such as sericite and carbonate are central. Placer gold adds stream and terrace mapping. Our guide to prospecting for gold deposits covers the deposit types and field signs.
- Copper: large porphyry systems are surrounded by broad, zoned alteration halos that remote sensing and mapping can outline, with magnetics and electrical methods helping at depth. See copper deposit types and where they occur.
- Lithium: hard-rock lithium is commonly hosted in pegmatites, so mapping granite-pegmatite fields and their surface expression matters most. Brine and clay deposits are the other two types, compared in our pegmatite, brine and clay lithium guide.
- Base metal sulphides: conductive bodies make electromagnetic geophysics a key tool alongside geochemistry.
- Industrial minerals and gemstones: host-rock mapping and surface mineralogy often dominate, with less reliance on geophysics.
Whatever the commodity, the question stays the same: where do the ingredients of the deposit model overlap? Satellite analysis is most useful when it is tuned to the target mineral and its alteration, which is why we ask for the target commodity with every area of interest.
Drilling
Only drilling proves a deposit. Reverse-circulation drilling is quicker and cheaper and returns chips; diamond drilling returns solid core for detailed logging, structural measurements and metallurgy. Early holes test targets; later infill holes on a regular pattern build the confidence needed for a resource estimate. Because drilling dominates exploration budgets, where the first holes go matters more than almost any other decision. Our guide to exploration drilling methods and costs covers hole planning in detail.
Exploration disturbance adds up: cut lines, access tracks, trenches and drill pads. Remote methods such as satellite analysis and airborne geophysics gather information with no ground disturbance, so surface work goes only where it is most likely to be worthwhile.
How exploration results are reported: targets, resources and reserves
Mineral exploration produces a lot of numbers, and public reporting codes control how they can be described. The JORC Code (Australasia), NI 43-101 (Canada) and similar codes aligned through CRIRSCO all separate early exploration information from resource and reserve estimates. Under the JORC Code (see our guide to JORC reports, classes and Competent Persons), the main categories are:
- Exploration Results: data from exploration programmes, such as assays and drill intercepts, that do not form part of a resource or reserve declaration.
- Exploration Target: an estimate of exploration potential, which the Code says must be quoted as a range of tonnes and a range of grade, for mineralisation with too little exploration to estimate a Mineral Resource. It must not be misrepresented as a resource or reserve.
- Mineral Resource: a concentration with reasonable prospects for eventual economic extraction, subdivided by increasing geological confidence into Inferred, Indicated and Measured.
- Ore Reserve: the economically mineable part of a Measured or Indicated Resource, defined by pre-feasibility or feasibility studies that apply the Modifying Factors.
This matters for anyone using satellite data. Our outputs are exploration targets and prospectivity rankings, not resources or reserves. They tell you where to map, sample and drill. Only drilling, assaying and a qualified person’s estimate can turn a target into a resource.
When a junior company quotes tonnes and grade, check which category it uses. An “Exploration Target” expressed as ranges, an “Inferred Resource” and a “Probable Reserve” carry very different levels of confidence. This is general information, not investment advice; Farmonaut is not an investment adviser.
What mineral exploration costs, and how long it takes
Mineral exploration is slow. S&P Global’s study of 127 precious and base metal mines that started production between 2002 and 2023 found an average of 15.7 years from discovery to production, with a range of six to 32 years. A later S&P analysis found the average rising to about 17.9 years for mines that started in 2020โ23, compared with 12.7 years for mines that started roughly 15 years earlier.
Costs vary enormously with location, access, commodity and depth, so any single figure would mislead. The structure of cost is more useful than the number. Desk work and remote sensing are cheap per hectare. Mapping and sampling cost more because they need people on the ground. Geophysics costs more again, and drilling costs most of all, often by an order of magnitude. That is why the funnel matters: each stage should shrink the area the next, more expensive stage has to cover.
- โ Cut early-stage cost: satellite screening can reduce early-exploration costs by up to 80โ85% compared with starting on the ground.
- โ Save time: it can shorten the first pass over new ground from months to days.
- Protect the drill budget: better-ranked targets mean fewer wasted holes.
- โ Remember holding costs: licence rents, work commitments and reporting keep running while you explore.
“Grassroots exploration fell to 21% of global budgets in 2025, the lowest share in S&P Global’s records.”
Licensing and access: securing ground to explore
You cannot explore ground you do not hold. In most countries mineral rights belong to the state, and explorers apply for a prospecting or exploration licence through a mining cadastre. Rules differ widely: grid-based cells or free-drawn polygons, first-come-first-served or tenders, annual rents per hectare and minimum work commitments. Our mining cadastre portal guide by country compares 17 jurisdictions, and our guide to mining licence types, fees and applications explains the title types you will meet.
Example: BC mineral exploration
British Columbia shows how an online system works. To acquire a mineral or placer title you need a Free Miner Certificate (CA$25 for individuals on the province’s New Client page when checked in September 2026, valid for 12 months) and a business BCeID to use Mineral Titles Online, where cell claims are registered. The province states that since March 26, 2025, new mineral and placer claim applications go through provincial review and First Nations consultation before a registration decision. Exploration work, or payment instead of work, is then registered to keep claims in good standing.
Screen the ground before you commit to rents and work obligations. The same boundary you would put into a licence application is all we need to run a satellite prospectivity analysis, so you can apply for the strongest ground rather than simply the open ground.
Where Farmonaut fits in a mineral exploration programme
We work at the top of the funnel. You send us an area of interest (coordinates, a KML/KMZ file or a polygon) plus the country and target mineral. We choose the right multispectral or hyperspectral data, analyse the spectral signatures of minerals and alteration zones, and flag likely mineralised target zones, alteration halos, faults and fractures. It shifts early mineral exploration from the ground to space, and screens large areas before field teams deploy.
- โ Premium mineral-intelligence report: high-potential zones, prospectivity heatmaps, estimated location and depth ranges, indicative quantity, geological interpretation (faults, alteration, host rock), seasonal anomaly validation, plus PDF and georeferenced GIS files.
- โ Premium+ report: adds TargetMaxโข drilling intelligence (optimal drilling-angle recommendations, higher ore-intersection probability, reduced drilling risk) and interactive 3D subsurface models of vein structures and mineral distribution.
- Turnaround: 5โ20 business days depending on area size and mineral complexity.
- Track record: 100,000+ hectares scanned, 20+ mineral types, 25+ countries across Africa, the Americas, Asia and Australia.
- โ What it is not: a resource estimate. Our targets are exploration targets that field work and drilling must confirm.
See a sample in the satellite-driven 3D mineral prospectivity mapping overview, request a quote for your area, or talk to our mining team.
Start your mineral exploration from space
Send us your licence or area of interest. We’ll return ranked target zones, alteration and structure maps and next-step guidance in 5โ20 business days โ before you commit field crews and drill rigs.
A mineral exploration checklist
- Define the deposit model: what commodity, what deposit type, and which geological ingredients it needs.
- Compile public data and screen the region with satellite analysis.
- Secure ground through the mining cadastre, sized to the best targets.
- Map and sample the highest-ranked areas first.
- Add geophysics where it can see what surface methods cannot.
- Rank targets where geology, geochemistry, geophysics and remote sensing agree.
- Drill the best targets and let results, not hope, decide what happens next.
- Report correctly: exploration results and targets are not resources.
With discovery-to-production times near two decades and grassroots budgets at record lows, the explorers who move fastest through the early stages, and drop weak ground quickest, have the best chance of finding the next district.
Guides in this series
Each stage above has its own, more detailed guide.
- How to read and plan a geological map: field methods, choosing a scale, and the symbols that matter.
- Geophysical survey methods compared: magnetics, gravity, radiometrics, EM, IP and seismic, with what drives survey cost.
- Satellite remote sensing for geologists: which sensors map iron oxides, clays and carbonates, and where they stop.
- Working with mining consultants: which specialist you need at each stage, and the CP/QP sign-off rules.
- Licences for mining and exploration: title types, fees and how an application works.
- Buying a gold claim: a 10-step due-diligence checklist, plus how listings are priced and what claims cost to hold.
- Ways to invest in gold mining: eight routes compared, from company shares and funds to royalties and direct project stakes.
- Concesiรณn minera (in Spanish): how to apply for a mining concession in Peru, Argentina and Colombia.
- Satฤฑlฤฑk maden sahasฤฑ (in Turkish): buying a licensed mining site in Tรผrkiye, from licence types to remaining term and transfer checks.
- Exploration drilling: what each rig type returns, what it costs per metre, and how to plan the first holes.
- The JORC Code explained: what a JORC report must include, resource and reserve classes, and Competent Person rules.
- Mining prospecting for gold: gold deposit types, surface signs and methods, and the start of our regional and commodity deposit guides.
- Where to find gold maps: government geology data, Google Earth and old mine records.
- Copper deposits by type and country: porphyry, sediment hosted and IOCG, and where to explore.
- Lithium deposits explained: pegmatite, brine and clay, and how each is explored.
- Maden haritasฤฑ ve altฤฑn arama (in Turkish): from MTA map data to the first drill hole in Tรผrkiye.
- Gold exploration from first map to first hole: deposit types, geochemistry, geophysics and drill planning for gold.
- 3D geological modelling software: eight tools compared, from Leapfrog and Micromine to free options.
- Gold exploration companies: juniors versus majors, and a six-point check before you invest.
- Carte gรฉologique et permis de recherche (in French): exploration permit terms, areas and fees in Morocco, the DRC, the Sahel and Quรฉbec.
- Estudio geofรญsico en exploraciรณn minera (in Spanish): geophysical methods and the permits needed in Peru, Colombia and Argentina.
- ุดุฑูุฉ ุชูููุจ ูุฑุฎุตุฉ ุงููุดู (in Arabic): exploration licence terms, areas and fees in Saudi Arabia, Oman, Morocco and Mauritania.
Frequently asked questions
What is mineral exploration?
Mineral exploration is the process of finding mineral deposits and establishing whether they could be mined economically. It combines geology, geochemistry, geophysics, remote sensing and drilling in stages, from regional target generation to resource estimation.
What is the difference between greenfield and brownfield exploration?
Greenfield (grassroots) exploration looks for deposits in areas with no known mine or deposit. Brownfield exploration searches around known deposits and operating mines. Greenfield offers bigger potential discoveries but carries more risk; brownfield is lower risk and benefits from existing infrastructure.
What are the stages of mineral exploration?
A typical sequence is target generation, reconnaissance, prospect definition, discovery drilling, resource drilling, and scoping, pre-feasibility and feasibility studies. Each stage narrows the area and raises the cost per hectare.
How long does mineral exploration take?
From discovery to production, S&P Global found an average of 15.7 years across 127 mines, with recent mines closer to 18 years. The exploration phase before discovery can add years more, which is why tools that speed up early stages are valuable.
What is the difference between prospecting and exploration?
Prospecting is the initial search for surface signs of mineralisation. Exploration is the systematic process that follows, using mapping, sampling, geophysics, remote sensing and drilling to test and measure a deposit.
What is the difference between exploration and mining geology?
Exploration geology finds and tests deposits: mapping, sampling, geophysics and drilling until a resource can be estimated. Mining geology works inside an operating or planned mine, controlling grade, updating the geological model and guiding extraction. Brownfield and minesite exploration sit where the two overlap.
Is a satellite target the same as a mineral resource?
No. Satellite analysis produces exploration targets and prospectivity rankings. Under codes such as JORC, a Mineral Resource needs sampling and geological evidence, usually from drilling, and a competent person’s estimate.
How does Farmonaut help mineral exploration?
We screen your area of interest with multispectral and hyperspectral satellite data to flag alteration, structures and ranked target zones, delivered as reports and GIS files in 5โ20 business days. It helps you decide where to map, sample and drill first.
Reviewed September 2026 against S&P Global Market Intelligence’s World Exploration Trends 2026 and lead-time research, its January 2017 Corporate Exploration Strategies extract, the JORC Code 2012, the CRIRSCO and Ontario Securities Commission NI 43-101 pages, Geoscience Australia’s mineral exploration page and the Province of British Columbia’s Mineral Titles pages.
Budget and lead-time figures come from S&P Global Market Intelligence as reported in its research and in mining press coverage; reporting definitions from the JORC Code 2012; geophysical methods from Geoscience Australia; the mineral systems concept from published Geoscience Australia research; and British Columbia requirements from the Province of British Columbia’s Mineral Titles pages. Fees and rules change, so confirm with the relevant authority. Satellite targets are exploration targets, not mineral resources. This page is general information, not investment, legal or financial advice.
