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File Created: 22-Apr-1991 by George Owsiacki (GO)
Last Edit:  02-Dec-2014 by Laura deGroot (LDG)

Summary Help Help

NMI
Name MCNEIL, MCNEIL CREEK Mining Division Fort Steele
BCGS Map 082F040
Status Prospect NTS Map 082F08E, 082G05W
Latitude 049º 22' 07'' UTM 11 (NAD 83)
Longitude 116º 00' 02'' Northing 5468914
Easting 572560
Commodities Lead, Zinc, Silver, Copper, Gold Deposit Types E14 : Sedimentary exhalative Zn-Pb-Ag
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

The McNeil property is entirely underlain by rocks of the Helikian Aldridge Formation (Purcell Supergroup) and predominantly comprise siltstones and quartzites. The sediments are relatively flat-lying and are thinly to very thickly bedded. A gently north-northeast plunging syncline is centred in the south part of the property. Lower Aldridge Formation rocks have been mapped on the east limb of the syncline, immediately north of the northeast trending Moyie fault. The west limb of the syncline is cut by the north trending McNeil Creek fault, a major steeply west dipping(?) normal fault with vertical displacement in the order of 1000 metres. Several thick, regional gabbro intrusions of the Proterozoic Moyie Intrusions also occur on the property. The uppermost of these, the "Hiawatha" sill, has been intersected in several diamond-drill holes.

Mineralization is of two types: 1) stratabound base metal sulphides developed at the Lower-Middle Aldridge Formation contact; and 2) a series of mineralized quartz veins in Middle Aldridge Formation rocks.

The stratabound mineralization generally occurs as banded sphalerite and as fracture-fillings and disseminations. A best drill intersection assayed 1.74 per cent zinc over 40 centimetres (Assessment Report 19989).

A series of sulphide-mineralized quartz veins occur in hydrothermally altered lower Middle Aldridge Formation quartzites and siltstones, just above the hanging wall of a regionally extensive, thick gabbro sill, on the west limb of the McNeil syncline. The veins occur near the gabbro hanging wall contact in an orthogonal set of fractures, of which two are steeply dipping and one is relatively flat. Wallrock adjacent to the vein zones are commonly altered. Vein widths range from a few centimetres to 1.5 metres. The veins carry galena, sphalerite, chalcopyrite and pyrite with gold and silver values. Cerussite and pyromorphite are extensively developed from weathering of galena, and chalcopyrite is typically oxidized to malachite; sphalerite has been weathered to smithsonite. The veins are oriented at approximately 120 degrees and are steeply dipping.

The best intersection of vein material assayed 13.99 per cent lead, 2.11 per cent zinc and 137.8 grams per tonne silver over 0.65 metre (Assessment Report 19989). There is a spatial and genetic relationship between the quartz veins and the "Hiawatha" sill, with the veins occurring near the juncture of feeder dike(s) and the gabbro sill.

Sedex Mining Corp. drilled the property in 1998. See McNeil (082FSE109).

Bibliography
EMPR ASS RPT 16606, 18117, *19277, *19989, 24916
EMPR EXPL 1998-68
EMPR GEOS MAP 1998-3
EMPR OF 1988-14; 2000-22
EMPR PF (Prospectors Report 1996-17 by Frank O'Grady)
GSC MAP 11-1960
GSC MEM 76; 336
GSC P 58-10
GCNL #182(Sept.22), #184(Sept.24), #191(Oct.5), 1998
Placer Dome File

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