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File Created: 17-Feb-2003 by George Owsiacki (GO)
Last Edit:  17-Feb-2003 by George Owsiacki (GO)

Summary Help Help

NMI
Name BASIN Mining Division Kamloops
BCGS Map 092I068
Status Showing NTS Map 092I09W
Latitude 050º 41' 07'' UTM 10 (NAD 83)
Longitude 120º 29' 37'' Northing 5617824
Easting 677048
Commodities Bentonite Deposit Types E06 : Bentonite
Tectonic Belt Intermontane Terrane Overlap Assemblage, Quesnel
Capsule Geology

The Basin property is located within a large Eocene basin reportedly up to 2000 metres thick. The property is situated over the lower Tranquille Formation (Kamloops Group) beds which attain thicknesses of up to 500 metres and are dominated by lacustrine, fossiliferous lake bed sediments with a varying tuffaceous component. These are occasionally interbedded with andesitic flows and lahars. This unit is overlain by a thick (up to 1300 metres) succession of andesitic flows, flow breccia and lahars of the Dewdrop Flats Formation (Kamloops Group). These formations are within a complex block-faulted basin with complex internal faulting which must have been active during deposition as represented by rapid facies changes and internal facies variations.

The Basin property covers an extensive section of lower Eocene Tranquille Formation sediments and tuffs. These units have undergone regional zeolite facies metamorphism. Work in 1996 has discovered a significant resource of sodium bentonite (smectite-montmorillonite) within a particular unit of the Eocene sequence consisting of mudstone, sandstone and tuff. The bentonite-bearing unit is a tuffaceous mudstone outcropping over a large area due to its dipslope nature and appears to range in true thickness from 50-80 metres. This unit contains a majority of the bentonite material (30 to 60 per cent of the mass) on the property. It is poorly bedded and weathers easily into a slippery light tan-white clay.

Prospecting, geological mapping and sampling was concentrated in a recent landslide area which has exposed a large area of bentonite-bearing material (in excess of 18 hectares) that appears visually to be homogeneous. Eleven samples from the slide scarp area were tested and yielded from 24.8 to 42.3 C.E.C. (cation exchange capacity). Other samples ranged from 41.1 up to 57.1 C.E.C. (Assessment Report 24674).

In 1996, geological mapping, prospecting and analytical work was completed on the Basin property on behalf of L.C. Marlow.

Bibliography
EMPR ASS RPT *24674
EMPR BULL 77
GSC OF 165; 980; 2490
GSC MAP 886A; 887A; 9-1963; 1394A; 42-1989
GSC MEM 249
GSC P 44-20; 82-1A, pp. 293-297; 85-1A, pp. 349-358

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