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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  14-May-2013 by Nicole Barlow (NB)

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NMI
Name ROSE-MUNRO LAKE, JASS, HEN, MUN, GLEN, ROSE, DALE, MUNRO LAKE Mining Division Osoyoos
BCGS Map 082E071
Status Prospect NTS Map 082E12W
Latitude 049º 44' 19'' UTM 11 (NAD 83)
Longitude 119º 56' 46'' Northing 5513735
Easting 287734
Commodities Silver, Copper, Zinc, Lead, Molybdenum Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks
Capsule Geology

The JASS showing is located 500 metres south of Eneas Lakes Provincial Park and approximately 24 kilometres northwest of Summerland.

The showing is hosted by a light-grey, weakly saussuritized porphyritic granodiorite of the Middle Jurassic Osprey Lake Intrusions. It is intruded by Tertiary dikes of quartz latite porphyry and quartz monzonite. Fracturing and cross-fracturing is common; one conspicuous fracture set has a strike between northeast and east with a steep southerly dip, and cross-fractures have various attitudes. Quartz and orthoclase form partly drusy veinlets up to 0.5 centimetre thick. Low grade alteration is pervasive with local narrow envelopes of sericitized country rock enclosing mineralized fractures and quartz veins. Pyrite, molybdenite and chalcopyrite, all partly oxidized, are disseminated in and close to the veinlets. The molybdenite is fine-grained, more abundant than chalcopyrite, and is primarily found in a later high-angle set of veins, which are almost always quartz-pyrite bearing.

In 1966, Lakeland Base Metals Ltd. discovered the JASS showing after following-up anomalous stream geochemistry. Soil geochemical surveys, trenching and approximately 600 metres of percussion drilling were carried out in 1966 as a result of options by Brenmac Mines Ltd. and Brenda Mines Ltd. The results of the drilling are unknown, but the options on the property were dropped. In 1967, Lakeland attempted to extend geochemical anomalies by additional soil sampling but were unsuccessful.

Canadian Occidental Petroleum Ltd. staked the property in 1973, and in 1974 they carried out an extensive program of rock, soil and stream geochemistry, magnetometer surveys, and diamond drilling of 3 holes for a total depth of 275 metres. Several copper-molybdenum- zinc anomalies were outlined by the surface work and 3 were drilled. The results of the drilling were not recorded.

In 1976, a Regional Geochemical Survey release identified highly anomalous silver values in streams draining the Munro Lake Plateau. As a consequence, in 1977 Canadian Occidental shifted their focus to the silver potential of the property, re-analysed their soil and drill core samples for silver and drilled a 171 metre BQ diamond-drill hole. The best intersection, between 99.0 and 100.6 metres, assayed 0.396 per cent zinc and 10 grams per tonne silver (Assessment Report 6558). In 1981, Canadian Occidental trenched the area north of the 1977 drillhole. The northernmost of the two trenches exposed a highly altered, rubbly, friable granodiorite with anomalous mineralization. A 108.2-metre section averaged 3.06 grams per tonne silver, 0.15 per cent zinc, 0.05 per cent copper, 0.003 per cent molybdenum and 0.008 per cent lead (Assessment Report 10445). This was considered sub-economic and no further work was recommended.

In 1986 Almaden Resources Corp. staked the JASS showing and proceeded to carry out a VLF-EM survey. The survey successfully identified two conductors of significant strike length, as well as multiple "one-line" anomalies. This was followed in 1987 by 23 overburden drillholes; the concentrates from 15 of these were anomalous in silver and zinc. In 1988, 34 overburden holes totaling 296 metres were drilled. Analysis by heavy mineral concentration identified three subparallel east-northeast trending gold-silver-zinc anomalous zones in the basal till layer. In 1990, Almaden carried out a geophysical program consisting of line-cutting and magnetometer, VLF-EM and scintillometer surveys. The program outlined a number of east-northeast trending anomalous areas believed to be associated with a lineament which is known to host quartz veins containing gold and silver values.

In 1994, Almaden contracted Delta Geoscience Ltd. to carry out induced polarization and resistivity surveys of the property. The results suggested that a large pyritic alteration system had been identified, measuring approximately 900 metres by 1600 metres long in an east-west direction. Sulphide mineralization within the main IP anomaly appears to be strongly controlled by intersecting northeast and east-west structures (George Cross Newsletter No. 220, 1994).

During 1996 and 1997, two drilling programs were conducted to test the eastern and western portions of a large 4 kilometre long induced polarization chargeability anomaly. The drilling programs partially defined a large, low-grade porphyry silver-copper-molybdenum anomaly that extends for at least 2.5 kilometres in an east-west direction. The strongest alteration and mineralization to date was intersected in drillhole M-96-3 (Assessment Report 25298).

No work was conducted on the area again until 2008, when Almaden Minerals designed a soil sampling program to define areas of greater metal concentration within the geophysical anomaly. The sample results included copper (greater than 112 parts per million), molybdenum (greater than 22.7 parts per million) and silver (greater than 5 parts per million) concentrations, defining a roughly 4 by 2 kilometre area of elevated stream sediment values for these elements (Assessment Report 30279).

Bibliography
EMPR AR 1967-213
EMPR ASS RPT *5318, 6399, *6558, 8921, *10445, *15207, *16437
18171, 20717, 23776, 24187, *24656, *25298, *30279
EMPR EXPL 1981-294; 1986-C38; 1987-C34; 1988-C23
EMPR GEM 1974-61; 1977-E35
EMPR OF 1994-8
EMPR PF (Dawson, J.M. (1985-11-15): Prospectus Report on the Munro Lake Silver Property; Almaden Resources Corporation (1991-01-10): Statement of Material Facts (#133/90); Hendrickson, G.A. (1994-11-08): Munro Lake Project Summary)
EMPR RGS 29
GSC MAP 538A; 15-1961; 1701A; 1712A; 1713A; 1714A; 1736A; 7686G;
8521G
GSC OF 409; 736; 1969
GCNL #108,#194, 1987; #126, 1990; #172,#210,#220, 1994; #119, 1995
V STOCKWATCH June 8, 1987

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