Zone (see map ) |
Location |
Description |
Pb |
Zn |
Ag Au |
Cu |
Mo |
Ni |
1 |
Bowser Creek |
The deposits in this area are (1) argentiferous galena-sphalerite or sphalerite-pyrrhotite deposits in limestone, and (2) pyrrhotite-sphalerite fracture fillings in igneous breccia. The deposits in limestone are replacement bodies and fissure veins. |
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2 |
Rat Fork |
Skarn zones 2 to 10 feet wide that contain pyrrhotite, sphalerite, and chalcopyrite are associated with some of the quartz diorite porphyry dikes. |
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3 |
Ozzna Creek |
Sulfide mineral deposits consist of small pods and narrow lenses of pyrrhotite, sphalerite, and argentiferous galena. The deposits are along shear zones in a felsic dike. The pods, although locally quite rich are small, ranging from 0.5 foot to 2 feet in width and from 1 foot to 3 feet in length. Sulfide veins 1 to 3 inches thick connect some pods.
Another lens of sulfide minerals is along an east-striking fault zone that cuts igneous breccia and a series of felsic and mafic. The fault zone is 3 to 15 feet wide, dips vertically, and shows intensive hydrothermal alteration. The sulfide lens has a maximum exposed width of 4 feet. It pinches out within 20 feet upward and to the west. Possible extensions below and east of the outcrop are covered by talus. Ore minerals in the lens are pyrrhotite, argentiferous galena, pyrite, and sphalerite. A selected sample of galena, sphalerite and pyrrhotite from this lens contains 70.4 ounces of silver per ton, 11.3% lead, and 7% zinc. |
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4 |
Smith Lake |
A small stock of quartz monzonite or granodiorite porphyry cuts limestone, siltstone, and argillite in the southern part of this area. Shear zones in dikes near the north side of the stock contain sphalerite and pyrrhotite in small lenses. |
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5 |
Sheep Creek |
This large igneous complex consists of porphyritic felsic intrusives in the form of dike swarms and small stocklike bodies. Anomalous lead and zinc values occur north and south of the igneous body. The bordering rock is chiefly limestone. Sulfide minerals occur in small veinlets and along shear zones. The largest deposit seen is a calcite vein in limestone on Hippie Creek. The vein contains pyrite and argentiferous galena in scattered grains and as discontinuous bands 1 to 10 inches wide. The vein strikes east-northeast, dips vertically, and is exposed discontinuously for about 100 feet along the creek where it appears to be along a fault. The vein has a maximum width of 6 feet and narrows eastward to about 6 inches. To the west surficial deposits cover the vein. Lead values downstream from the vein are low, but slightly anomalous lead values upstream, and a similar occurrence of calcite, pyrite, and galena in a narrow shear suggest that other lead-silver occurrences may be present. Viewed individually, these small deposits have no apparent economic significance, but they might justify some prospecting for larger concealed deposits. |
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6 |
Dahl-6120 |
BMP’s Dahl-6120 gold-copper belt was originally discovered by the Anaconda Mining Company who drilled two highly encouraging holes 20 years ago but never followed them up. The two holes drilled by Anaconda intersected a massive sulfide body hosted in shale with grades of 4.0% copper, 0.3% lead, 1.0% zinc and 370 g/t silver over a true thickness of 3.5 meters (11.48 feet) and 0.9% copper, 1.0% lead, 6.0% zinc and 177 g/t silver over a true width of 5.5 meters (18.04 feet). This drilling linked with ground geophysical data indicates continuity of the sulfide body over at least 150 m (492.12 feet) of strike.
Sampling by International Tower Hill of the 6120 target returned average grades of 2.3% copper, 3.4g/t gold, 33g/t silver, 0.16% nickel and 0.07% cobalt from 20 samples of an outcropping skarn zone. In total the past and recent work in this one relatively small area of the BMP land package suggest that the high-grade mineral system has a strike length of at least 8 kilometers (26,246.71 feet) and that the Dahl-6120 target offers significant potential for discovery of a major new precious-metal rich, base metal deposit. |
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7 |
Saint Johns |
The anomalous nickel values may be related to mafic or ultramafic bodies that are emplaced locally along segments of the Farewell fault in this part of the Alaska Range. The source of the copper, molybdenum, and zinc in the sediments is not known. |
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8 |
Jay Creek |
Several stream-sediment samples from Jay Creek show anomalous values for molybdenum and one high value for lead. Sulfide deposits are not known to occur in this drainage--an area underlain chiefly by siltstone, shale, and limestone.
The lead anomaly, which is in a creek that drains the west side of the intrusive breccia at Bowser Creek, probably reflects lead deposits farther upstream near the intrusive contact. The anomalous molybdenum values at Jay Creek and in the southern part of the map area cannot be readily explained. Their distribution does not correspond to e x p o s e d igneous rocks, but the highest values (10-30 pprn) trend in a northeast direction and show a strong correlation with the faults. South of the map area stocks and batholiths are present; it is possible that the molybdenum values represent "leakage" of metal-bearing fluids that have migrated upward along the faults from buried intrusive rocks. |
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