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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  04-Aug-2020 by Karl A. Flower (KAF)

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Name LILY MAY (L.1052), LILLY MAY, RICHMOND Mining Division Trail Creek
BCGS Map 082F001
Status Past Producer NTS Map 082F04W
Latitude 049º 03' 24'' UTM 11 (NAD 83)
Longitude 117º 48' 51'' Northing 5434074
Easting 440518
Commodities Silver, Copper, Lead, Zinc, Gold Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Quesnel, Kootenay
Capsule Geology

The Lily May mine is underlain by siltstone and hornfelsic siltstone of the Lower Jurassic Elise Formation, Rossland Group. The occurrence is located 400 metres south of the southern edge of the Early Jurassic Rossland Monzonite and lies within the zone of thermal metamorphism associated with the monzonite intrusive. The grey to black siltstone and argillite grades to hornfels. Ammonites of Early Jurassic age were reported to occur in the siltstone on Ivanhoe Ridge.

Mineralization consists of veins, crosscutting the siltstone, hosting pyrite, pyrrhotite, magnetite, chalcopyrite, sphalerite, galena and minor stibnite. The vein system is considered part of the South belt of mineralization in the Rossland Camp. The ore is composed of fine-grained, disseminated, or crudely banded, massive sulphides in a gangue consisting of thoroughly sericitized rock with carbonate and quartz. The gangue consists mainly of quartz with altered wallrock. The deposit strikes 135 degrees, dipping 85 degrees north. Minor magnetite skarns also occur.

In 1910 and 1935, a total of 37 tonnes of ore were mined from the vein system with the resulting recovery of 124 grams of gold, 18,506 grams of silver, 549 kilograms of copper, 407 kilograms of lead and 578 kilograms zinc.

At the Lily May mine, considerable galena occurs in massive form showing cleavage cubes 0.6 centimetres in diameter. The galena is argentiferous and is associated with the sphalerite, chalcopyrite, pyrrhotite and minor stibnite. Boulangerite occurs in the ore. Also, a small amount of galena occurs as narrow bands and irregular masses interstitial to bladed and tabular crystals of boulangerite.

EMPR AR 1890-368; 1896-15,17,31,518,559; 1897-537,544; 1898-1096;
1899-599; 1905-172; 1910-116,244; 1913-135; 1921-151; 1935-A28,E21;
EMPR ASS RPT 24, 34, 9054
EMPR BULL *74; 109
EMPR EXPL 1980-59
EMPR FIELDWORK 1987, pp. 19-30; 1988, pp. 33-43; 1989, pp. 11-27;
1990, pp. 9-31
EMPR OF 1988-1; 1989-11; 1990-8; 1990-9; 1991-2; 1991-16
GSC MAP 1004; 1504A; 1518
GSC MEM 77, pp. 5,77,170
GSC P 79-26
ECON GEOL Vol.68, 1973, pp. 1337-1346
PERS COMM Andrew, K., March 1991
*Thorpe, R.I. (1967): Controls of Hypogene Sulphide Zoning, Rossland,
British Columbia, Ph.D. Thesis, University of Wisconsin
Howard, A.E. (2018-04-09): Technical Report on the Rossland Project