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U.S. Geological Survey Circular 559
Lead, Zinc, and Silver Deposits at Bowser Creek McGrath A-2 Quadrangle
By Reed & Elliott

... Much of the area shown as limestone in figure 3.1 (the North Zone) is covered by talus. However, mineralized skarn which appears to have potential economic significance locally crops out near the granodiorite porphyry and felsite dikes. The skarn typically consists of pyrrhotite and sphalerite (marmatite), associated with a variety of silicote minerals including epidote, clinopyroxene, quartz, and chlorite. The iron-bearing sulfide minerals weather to a deep reddish brown. There are scattered exposures of skarn in talus along the east side of the granodiorite porphyry. The skarn zones are as much as 25 feet across, and if they prove continuous beneath talus cover, then a north-trending skarn zone at least 1,000 feet long is indicated .

Alaska Division of Mines & Geology Property Examination Report #74-2
By Robert Anderson, Mining Engineer

...Work had just begun on this side of the creek. Each o f the four trenches on the lower part of the hill exposed veins, all steeply dipping and striking about N 55∫ E. Between the trenches and t h e few rock exposures showing through the extensive talus there appears to be a t least 8 veins, 75 feet to 250 feet apart, varying in thickness up to about 12 feet. At least two veins can be traced along their strike into the next drainage to the north. Each vein seems to pinch and swell sporadically, and the sulfide mineralization along the vein stops and starts abruptly. The veins where exposed show a dark brown to red brown iron staining, but usually within a foot or two of the surface the sulfide minerals are only slightly altered.

The veins that strike N 55∫' E are cut off on the west by a felsite dike and associated veinlets which dip steeply and strike roughly N 15∫ E and which are apparently related t o those on the southwest side of the creek. Mineralization of the N 55∫ E veins is higher in galena and lower in sphalerite than the veins on the southwest side of Bowser Creek. Apparently the felsite dikes and associated mineralization mineralization are younger than the N 55∫ E veins. It would be interesting to study the contact between the two systems, but no trenching had been done along the dike to expose contacts.

Approximate ratio of major s u l f i d e minerals observed were:
Sphalerite 70
Pyrrhotite 20
Galena 10

Silver assays of the veins range from 2 oz. per ton to as high as 50 oz. per ton. Again, there has been no attention paid to the country rock between veins.

Alaskamin— Office of Minerals Exploration Application
James Orr, Geologist

...Drawings Nos. 3, 4 and 7 show the area north of Bowser Creek where diamond drill holes have been planned. . The geologic structure, lithology, alteration and mineralization are similar to the S-1 zone. Separate veins have been exposed on opposite sides of the central felsite dike. Both are some 150 feet long. One sample taken of the easterly showing assayed:

Sharp p, 17 Ag, 3.91 oz./ton; Pb, 3.91%;
Zn, 5.84%; Cu, 0.23% across 6 ft.

The westerly showing, beneath heavy talus and exposed and sampled via two trenches , has an average metal content of:
Ag, 11.6 oz/ton ;P b, 25.6%;
Zn, 18.7%: Cu, 0.03% across 2.5 f t .

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