Advance mine, Chief Mining District, Lincoln County, Nevada, USAi

Regional Level Types
Advance mine	Mine
Chief Mining District	Mining District
Lincoln County	County
Nevada	State
USA	Country

Sec 17 T3S R67E
Structure: Minor Fractures

Commodity: Other ore minerals not given in the literature

Deposit: Ore consists of iron-stained brecciated quartzite. Ore is a massive greenish to brownish vuggy aggregate of arsenopyrite replaced by scorodite in turn replaced by a brown micaceous mineral. Thin seams of shattered quartzite and gouge on lower level.

Development: Surveyed for patent in 1902. Mined in 1934. Most extensive workings of the district.

Geology: Ore shoot in n-s vein at fracture intersection, 40 ft. Long, 3.5 ft wide, several veins strike N 30 W to N 30 E . Mineralization occurs in gouge material. At upper adit, host rock is orange weathered quartzite or silty sandstone which forms 0.5-2 ft thick beds striking n10w, dip 35 ne. The rock on the dump is slightly laminated vitreous grey (fresh) quartzite which shows some calcite and quartzite veining. The rocks are silicified, recrystallized, with some sericite in matrix. In general, the quartzites are covered with abundant iron oxides and yellow and green oxides of perhaps as, pb, fe, or other. Some of the altered quartzites contain iron-stained quartz- and calcite-filled vugs. Adits line up along n- to ne-trending vein systems, which apparently follow the bedding of the host rocks. The bedding plane fractures were apparently the main structural control for vein emplacement, As not much breccia was observed.. Mineralization occurs in gouge material. At upper adit, host rock is orange weathered quartzite or silty sandstone which forms 0.5-2 ft thick beds striking n10w, dip 35 ne. The rock on the dump is slightly laminated vitreous grey (fresh) quartzite which shows some calcite and quartzite veining. The rocks are silicified, recrystallized, with some sericite in matrix. In general, the quartzites are covered with abundant iron oxides and yellow and green oxides of perhaps as, pb, fe, or other. Some of the altered quartzites contain iron-stained quartz- and calcite-filled vugs. Adits line up along n- to ne-trending vein systems, which apparently follow the bedding of the host rocks. The bedding plane fractures were apparently the main structural control for vein emplacement, As not much breccia was observed.

Ore(s): Fracture Intersection; Brecciation Of Quartzite.

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Link to USGS MRDS:	10037350

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References