Schroff-O'Neil; Newman and Miller; Miller-Newman Mine, Willow Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Schroff-O'Neil; Newman and Miller; Miller-Newman Mine	Mine
Willow Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

This mine apparently was originally referred to as the Newman and Miller prospect (Brooks, 1925).
Location: 2,000 ft east of the end of unimproved road that parallels Craigie Creek. Marked with quarry symbol and labeled 'Schroff-O'Neil Mine' on the Anchorage D-7 1:63,360-scale topographic map. Accurate within 400 ft. Locality 15 of Cobb (1972) and locality 12 of MacKevett and Holloway (1977).
Geology: Mine located on an erosional remnant of a 1 to 6 inch thick quartz vein that cuts the Willow Creek Pluton. The coarsely crystalline quartz vein carries gold; the tellurides nagyagite, altaite, and coloradoite(?); galena in large cubes; pyrite; sphalerite; chalcopyrite; and tetrahedrite. The vein strikes N 70 E and dips 21 to 34 NW. The main vein is crossed by a barren copper-stained quartz vein. Ore deposition was apparently localized at the vein intersections. Nagyagite is an important mineral in that free gold shows a preference to it, especially in the richer ore. Some nagyagite and gold deposition appear to be contemporaneous (Ray, 1954). The Willow Creek Pluton is a zoned pluton: the outer part consists of hornblende quartz diorite and lesser hornblende tonalite; the core consists of hornblende-biotite granodiorite, and lesser hornblende-biotite quartz monzodiorite and biotite quartz monzonite. Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).
Workings: Developed by 60 ft of open cuts in 1923 (Brooks, 1925). Most of the erosisional remnant was mined out by 1950 (Ray, 1954).
Age: Late Cretaceous or younger; vein cuts the Late Cretaceous Willow Creek Pluton.
Alteration: Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).

Commodities (Major) - Au; (Minor) - Cu, Pb, Te, Zn
Development Status: Yes; small
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Other Databases

Link to USGS - Alaska:	AN027

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References