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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  21-Nov-1995 by Gilles J. Arseneau (GJA)

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NMI 082F14 Ag33
Name ALMEDA (L.628), ECHO (L.2057), OLD ORIGINAL ECHO, ALAMEDA Mining Division Slocan
BCGS Map 082F095
Status Past Producer NTS Map 082F14E
Latitude 049º 59' 30'' UTM 11 (NAD 83)
Longitude 117º 09' 39'' Northing 5537717
Easting 488472
Commodities Silver, Lead, Zinc Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Quesnel
Capsule Geology

The Echo (Lot 628) and Almeda (Lot 2057) Crown-granted claims are in the upper basin of Jackson Creek, northeast of and adjoining the Bell-Sunset group.

Workings include 2 shafts and 8 adits, of which 4 are driven from Almeda and 4 from Echo ground. The adits are short, and at the time of Cairnes visit in 1935, were largely inaccessible.

In the Almeda drift adit, driven southwest along the lode, the lode was first encountered about 6 metres from the portal beneath the porphyry sill and was followed southwestward for about 18 metres to a shaft from the surface on the Echo-Almeda line. This adit apparently extended for only a short distance south of the shaft to a fault, beyond which no attempt has been made to pick up the lode. Just south of the shaft, stopes extend to the surface. About 21 metres lower and 61 metres to the west of the portal of the Almeda drift is the portal of the "Old Original" Echo drift running southeasterly along a fault fissure dipping 45 degrees southwest. This adit is about 122 metres long and at 76.2 metres from the portal a branch drift runs south 55 degrees west along a small slip for 36 metres to where the fissure swings to a south 20 degree west direction. Vein matter found here consisted of about 7 centimetres of mixed sphalerite, galena and pyrite.

Other workings on the property were inaccessible and were not examined by Cairnes. However he states: "The impressions left were that the formation here being mostly of a slaty or broken character was hardly conducive to important mineralization that if the principal lode, as seems probable, is the one followed in the main Echo crosscut tunnel the mineralization is evidently playing out rapidly with depth..."

Regionally, the area lies on the western margin of the Kootenay Arc, in allochthonous rocks of the Quesnel Terrane. In the vicinity of the occurrence, the Quesnel Terrane is dominated by the Upper Triassic Slocan Group, a thick sequence of deformed and metamorphosed shale, argillite, siltstone, quartzite and minor limestone. Rocks of the Slocan Group are tightly and disharmonically folded. Early minor folds are tight to isoclinal with moderate east plunging, southeast inclined axial planes and younger folds are open, southwest plunging with subhorizontal axial planes. The sedimentary sequence has been regionally metamorphosed to lower greenschist facies.

South of the occurrence, the Slocan Group has been intruded by the Middle Jurassic Nelson intrusions which comprise at least six texturally and compositionally distinct phases ranging from diorite to lamprophyre. The most dominant phase is a medium to coarse grained potassium feldspar porphyritic granite. Several feldspar porphyritic granodiorite dikes, apparently related to the Nelson intrusions, also cut the sedimentary sequence near the occurrence (Paper 1989-5).

On the Almeda Crown grant, the Slocan Group rocks consist of interbedded slate and fractured argillite. The strata strike north, dip 55 degrees east and are intruded by mafic and felsic dikes. The occurrence consists of at least two separate veins. The main Almeda vein strikes 020 degrees and dips 55 degrees southeast. It underlies and partly cuts across a sill-like quartz porphyritic intrusion and is cut off to the south by a northwest-trending fault. The vein has been explored for 45 metres along strike and 55 metres downdip, in at least five adits and a shallow shaft.

Approximately 60 metres west of the main vein, the Old Original Echo vein strikes southeast and dips 45 degrees southwest. This vein consists of a 10-centimetre wide seam of sphalerite, galena, pyrite and siderite within fractured argillite. The vein has been exposed in at least one 120-metre long adit. A short distance east of the shaft, a series of stopes break through to the surface. These are aligned southeast, dip 45 degrees southwest and may represent the faulted extension of the Old Original vein (Geological Survey of Canada Memoir 184).

Production from the Almeda and Old Original Echo veins in 1903 yielded 52,129 grams of silver and 7815 kilograms of lead from 13 tonnes mined.

Bibliography
EMPR AR 1898-1083,1188; 1899-843; 1904-199
EMPR BC METAL MM01175
EMPR BULL 29
EMPR INDEX 3-195
EMPR P 1989-5
GSC MAP 273A; 1090A; 1091A; 1667
GSC MEM 173, p. 16; *184, pp. 185,214, Fig.13; 308, p. 130
CANMET IR 12 (1906), p. 182

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