- Mineral Resources
- Online Spatial Data
- National Mineral Resource Assessment 1998
Mineral assessment tracts in Big Delta (1:250,000 Alaska quadrangle in USGS Quadrangles)
[Additional scientific data in this geographic area]
- AK-EC04: Epithermal vein, generic (25) (Cretaceous - Tertiary) , covers 7 % of this area
- The number of undiscovered deposits in this tract was not estimated.
- AK-EC07: Low-sulfide Au-quartz veins (36a) (Cretaceous - Tertiary) , covers 97 % of this area
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- AK-EC13: Porphyry Cu, BC-Ak type (17) (Cretaceous - Tertiary) , covers 80 % of this area
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- AK-EC14: Plutonic porphyry Au (43) (Cretaceous - Tertiary) , covers 86 % of this area
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- AK-EC15: Placer Au (39a) (Cenozoic) , covers 97 % of this area
- The number of undiscovered deposits in this tract was not estimated.
- AK-EC18: Polymetallic vein (22c) (Mesozoic - Tertiary) , covers 97 % of this area
- The number of undiscovered deposits in this tract was not estimated.
- AK-SC07: Au-Sb veins (36c) (Cretaceous - Tertiary) , covers < 0.1 % of this area
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- AK-SC14: Kuroko massive sulfide (28a) (Devonian - Mississippian) , covers 2 % of this area
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- AK-SC20: Porphyry Cu, BC-Ak type (17) (Cretaceous - Tertiary) , covers < 0.1 % of this area
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- AK-SC24: Plutonic porphyry Au (43) (Cretaceous - Tertiary) , covers < 0.1 % of this area
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- AK-SC25: Placer Au (39a) (Cenozoic) , covers < 0.1 % of this area
- The number of undiscovered deposits in this tract was not estimated.