Royal Development Mine (Red Mountain Mine; Royal Mine; St. Francis Mine; Trinity Mine; Trinity Tunnel), Trinity, Phelps Ridge, Chiwawa District, Chelan Co., Washington, USA

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A Cu-Ag-Au mine located in secs. 15 and 22, T__, R___, __M, at the S end of Phelps Ridge (Red Mountain). This mine was discovered in the early 1890's.

Mineralization occurs most extensively in a brecciated zone between Swakane Biotite Gneiss and an unnamed Diorite.

Workings include surface and underground openings comprised of numerous prospect pits, the 1,500 foot Leprachaun adit, 11,000 foot Trinity adit, 850 feet of raises, the 650 foot St. Francis adit, the 280 foot T.A.K. adit, the 200 foot LD adit, a 40 foot discovery adit, a newer adit, unknown length, several drifts, four production levels and interconnected stopes.

It produced more than 15,000 tons of ore from 1930, 1935-1937, and 1940. As of 1982 18,000 tons had been produced.

Mineral List

Arsenopyrite Biotite Calcite Chalcopyrite

'Chlorite Group' Galena Kyanite Muscovite var: Sericite

Pennantite Pyrite Pyrrhotite Quartz

Scheelite Schorl Sphalerite

15 entries listed. 12 valid minerals.

References