Where Is Pebble Mine Located? Alaska Map & Biome Guide

Reviewed September 2026 against Northern Dynasty Minerals project filings, the US EPA’s Bristol Bay watershed assessment, and the US Army Corps of Engineers permit record.

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Pebble Mine is not built. It is a proposed open-pit copper, gold, and molybdenum deposit sited at approximately 59.897°N, 155.295°W in southwestern Alaska, on state land near the village of Iliamna, about 150 miles southwest of Anchorage. The deposit lies inside the Bristol Bay watershed, at the headwaters of river systems that feed the Kvichak and Nushagak drainages, in a biome that transitions from boreal spruce forest into subarctic tundra. As of April 2024, the US Army Corps of Engineers has upheld its 2020 denial of a federal permit for the project, so no mine currently operates at this location.

Where Is Pebble Mine Located? Coordinates & Map

Search “where is the Pebble Mine located” and most results give you a state name and stop. The precise answer: the Pebble deposit sits at 59.897°N, 155.295°W, per Northern Dynasty Minerals’ own project location filing. That places it in the Lake and Peninsula Borough of southwestern Alaska, on the isthmus between Iliamna Lake and Bristol Bay, roughly 15 miles from the village of Iliamna and about 150 miles southwest of Anchorage by air.

• ✔ Coordinates: 59.897°N, 155.295°W (Northern Dynasty Minerals, project location filing)
• ✔ Region: Lake and Peninsula Borough, southwestern Alaska
• ✔ Nearest settlement: Iliamna village, on Iliamna Lake
• ✔ Distance from Anchorage: ~150 miles southwest
• ✔ Watershed: Bristol Bay drainage, at headwaters feeding the Kvichak and Nushagak river systems
• ✔ Status: Undeveloped — no active mine at this site as of the most recent federal permit ruling (US Army Corps of Engineers, April 2024)

If you’re plotting this yourself: enter 59.897, -155.295 into any mapping tool and you’ll land on the state land parcel Northern Dynasty holds mineral claims over, west of the Chigmit Mountains and south of the Alaska Range’s western foothills. There is no single “Pebble Mine map” published by a federal agency because the site has never received the permits needed to become an operating mine — what exists are claim-block maps from the project developer and watershed maps from the EPA showing the same coordinates in ecological context.

For readers mapping any mineral project — not just Pebble — against real terrain, our interactive satellite mapping platform overlays claim boundaries, vegetation, and hydrology on the same imagery used throughout this article.

What Biome Is Pebble Mine Located In?

A Boreal Forest–Tundra Transition Zone

“What biome is it in” has a specific answer at these coordinates: Pebble sits on the ecological boundary between boreal forest (taiga) and subarctic tundra — a transition zone rather than a single, uniform biome. This matters for the search itself, because it’s the reason no single one-word biome label (just “tundra,” just “forest”) is accurate.

• 🌲 Boreal/taiga forest: White and black spruce, birch, and poplar stands, providing cover for moose and caribou and nesting habitat for migratory songbirds.
• ❄️ Subarctic tundra: Open, low-relief terrain with mosses, sedges, and dwarf shrubs over discontinuous permafrost.
• 🌊 Wetlands and willow carrs: Seasonally flooded transition zones bordering streams, functioning as filtration and nursery habitat.
• 🦦 Headwater streams: Cold, clear, low-sediment water — the specific condition Pacific salmon need for spawning and egg incubation.

The climate at this latitude runs cool summers and long winters, with snowpack accumulation that releases gradually through spring and summer melt — the mechanism that keeps these headwater streams flowing and cold through the salmon spawning season. This is the same hydrological detail that makes the site’s biome relevant to the mining question at all: change the snowmelt timing or sediment load, and you change conditions in streams salmon depend on downstream.

Northern Dynasty’s own claim area spans roughly 92 square miles (238 km²), all inside this boreal-tundra mosaic. That’s the area referenced whenever you see “Pebble Mine area” cited in project documents — it is the claim block, not a footprint of actual disturbed ground, since no construction has occurred.

Why the Biome Composition Matters

• 🎣 Headwater streams inside the claim area connect directly to the Kvichak and Nushagak systems, which drain into Bristol Bay.
• 🦡 Terrestrial wildlife corridors: Moose, caribou, and brown bear ranges cross the forest-tundra boundary seasonally.
• 🦅 Migratory bird flyways: Wetland mosaics in this zone are documented stopover and breeding habitat.
• 🐸 Cold, low-turbidity water supports aquatic invertebrate populations that form the base of the salmon food chain.

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Pebble Mine and the Bristol Bay Watershed

Why This Specific Location Is Contested

The Bristol Bay watershed covers about 40,000 square miles, per the US EPA, and the Pebble deposit sits at its headwaters — not downstream of the fishery, but at the source of water feeding it. This positioning, more than the minerals themselves, is what has driven a decade-plus of federal review.

Bristol Bay produces roughly 50% of the world’s wild sockeye salmon, according to the Bristol Bay Sockeye Salmon organization, and The Nature Conservancy estimates the annual economic value of the Bristol Bay sockeye fishery at $2.2 billion. Those two figures — half the world’s wild sockeye supply, running through a $2.2 billion annual fishery — are the actual stakes tied to this specific set of coordinates.

• 📊 Watershed size: ~40,000 square miles (US EPA).
• 📊 Global salmon share: ~50% of the world’s wild sockeye salmon originates here (Bristol Bay Sockeye Salmon organization).
• 📊 Annual fishery value: $2.2 billion (The Nature Conservancy).
• 🛶 Subsistence use: Alaska Native and rural communities in the region depend on these same waters for fishing and gathering.

What a Mine at This Site Would Risk

• ⚠ Tailings storage failure: A dam breach would release metal- and sediment-laden water into headwater streams with no buffer before reaching salmon habitat.
• ⚠ Sedimentation: Runoff and construction silt can bury spawning gravel salmon need for egg incubation.
• ⚠ Altered flow regime: Water withdrawal or diversion changes the timing and volume of snowmelt-fed flows downstream.
• ⚠ Wetland loss: Any road or facility footprint removes wetland acreage that currently buffers and filters water before it reaches rivers.

Farmonaut’s Role in Monitoring Sites Like This

• 🔍 Remote detection of surface disturbance and hydrological change without on-the-ground access.
• 📊 Tracking snowmelt timing, wetland extent, and riparian vegetation across a claim area over time.
• 🛰️ Multispectral and hyperspectral mapping for satellite-based mineral detection, used for non-invasive exploration and environmental baseline work in sensitive watersheds.

What’s Mined at Pebble? Resource Scale & Regional Economy

Copper, Gold, and Molybdenum

Northern Dynasty describes Pebble as one of the largest undeveloped copper-gold-molybdenum deposits in North America. For the geology, deposit type, and full resource breakdown, see our companion piece on what’s actually mined at Pebble — this article focuses on location and biome, so we won’t duplicate that resource data here.

• ⛏ Copper: Priced on the London Metal Exchange, which publishes daily spot prices at lme.com — check there for the current rate rather than a fixed figure here, since copper is one of the more volatile base metals.
• ⛏ Gold: A secondary co-product at Pebble; USGS Mineral Commodity Summaries publishes annual US and global gold production and reserve estimates.
• ⛏ Molybdenum: A byproduct used in steel alloying and industrial applications.

A project at this scale would require open-pit mining, ore processing infrastructure, and tailings storage — construction that intersects the forest, wetland, and stream habitats described above, plus new roads and power infrastructure through currently roadless terrain.

• 🚛 Infrastructure: Roads, power transmission, and processing facilities would open currently roadless terrain, the main mechanism by which mining affects habitat beyond the pit footprint itself.
• 🌾 Subsistence use: Local and Indigenous communities’ fishing and gathering depend on watershed conditions upstream of any development.

For geologists and investors assessing any mineral prospect against terrain and habitat data before fieldwork, satellite-driven 3D mineral prospectivity mapping lets you evaluate mineralized zones without the site visit.

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Permit Status: Is Pebble Mine Being Built?

This is the part of the story that keeps changing, so treat it as a live process rather than a settled fact. As of April 2024, the US Army Corps of Engineers affirmed its 2020 denial of the federal Clean Water Act permit Pebble needed to proceed, per Alaska Public Media’s reporting on the Corps’ decision. That denial remains the operative federal status at time of writing — no mine has been permitted or constructed at this location.

• 🧑‍⚖️ April 2024: US Army Corps of Engineers upholds its 2020 permit denial (Alaska Public Media).
• 🧑‍⚖️ 2020: Original Clean Water Act Section 404 permit denial issued by the Corps.
• 🧑‍⚖️ Ongoing: Northern Dynasty Minerals continues litigation and appeals; check the company’s investor relations page for quarterly SEC filings on legal status.

How to check the current status yourself: the Alaska Department of Natural Resources maintains a Pebble project page tracking state-level permitting action, and Northern Dynasty Minerals publishes quarterly SEC filings covering litigation and negotiation updates. Neither this article nor any snapshot in time should be treated as the final word — verify against those two sources before making a claim about where the project currently stands.

For tailored project quotes, ecosystem analysis, or geospatial intelligence solutions for responsible mining:

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Watershed Impact Distance Calculator

Use your own site’s distance to a salmon-bearing stream and its claim area to estimate the scale of watershed exposure, using the same ratio between Pebble’s 92-square-mile claim block and the 40,000-square-mile Bristol Bay watershed it sits inside.

Assumptions: this is a simple proportional index, not a hydrological or environmental risk model. It compares claim size to watershed size and weights by position and stream proximity to give a rough relative-exposure score for comparing sites — it does not account for soil type, slope, tailings design, or actual flow data. Use it as a starting conversation point, not a permitting or engineering figure.

How Satellite Monitoring Tracks Sites Like Pebble

Satellite-based mineral detection and geospatial intelligence are changing early-stage mining exploration, particularly in remote terrain like southwestern Alaska where ground access is limited by season and terrain. Farmonaut helps mining, agriculture, and forestry stakeholders evaluate sites without disturbing them.

• 🛰️ Rapid remote detection: Site assessment timelines compress from months to weeks, without ground disturbance in sensitive biomes like the Bristol Bay watershed.
• 📊 Digital prospectivity mapping: Identifies mineral target zones and geological structures through spectral analysis rather than physical sampling alone.
• 🌱 Environmental baseline tracking: Monitors wetland extent, vegetation health, and surface water change over a claim area across seasons.
• ⛏️ Multi-mineral capability: Detection workflows cover copper, gold, molybdenum, rare earths, and industrial minerals.

For a closer look at the detection technology itself, see satellite-based mineral detection. To map your own project’s claim boundaries against terrain and hydrology data, Map Your Mining Site Here.

Pebble Mine: Location & Biome Reference Table

FAQ: Pebble Mine Location and Biome

Where is Pebble Mine located?

Southwestern Alaska, at approximately 59.897°N, 155.295°W, near the village of Iliamna and about 150 miles southwest of Anchorage, inside the Bristol Bay watershed (Northern Dynasty Minerals).

Where is Pebble Mine located on a map exactly?

Plot 59.897, -155.295 on any mapping service. That point sits on state land in the Lake and Peninsula Borough, on the isthmus between Iliamna Lake and Bristol Bay’s drainage. No official federal “Pebble Mine map” exists because no mine has been permitted; the developer’s own claim-block maps and the EPA’s watershed maps both use this same coordinate.

What biome is the Pebble Mine located in?

A boreal forest–subarctic tundra transition zone: spruce/birch forest stands, open tundra, wetlands, and willow carrs, crossed by cold headwater streams.

What biome map shows Pebble Mine’s biome?

There’s no single standardized “Pebble biome map” published by a federal agency. The most reliable way to see it is layering USGS ecoregion boundary data with Northern Dynasty’s claim-block coordinates (59.897°N, 155.295°W) in any GIS or satellite mapping tool.

What is the Pebble deposit, exactly?

A proposed open-pit copper-gold-molybdenum deposit, not an operating mine. For resource type and scale, see Pebble Mine Resources: What Type Is Mined in Alaska.

Is Pebble Mine currently operating?

No. As of April 2024, the US Army Corps of Engineers upheld its 2020 denial of the federal Clean Water Act permit required to build it. Check Northern Dynasty Minerals’ SEC filings and the Alaska DNR’s Pebble project page for the current legal and permitting status.

Conclusion: How to Verify This Yourself

The location itself — 59.897°N, 155.295°W, southwestern Alaska, Bristol Bay watershed — is fixed and won’t change. What will change is the permit status, any updated resource estimate, and possibly the claim boundaries themselves. Three sources are worth bookmarking if you’re tracking this beyond today: Northern Dynasty Minerals’ quarterly SEC filings for resource and litigation updates, the Alaska Department of Natural Resources’ Pebble project page for state permitting status, and the US EPA’s Bristol Bay watershed page for the underlying ecological data this entire dispute turns on.

That’s the durable way to answer “where is Pebble Mine located” a year from now: the coordinates won’t move, but always check whether the permit status attached to them has.

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