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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  08-Jul-2020 by Nicole Barlow (NB)

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NMI
Name POOLEY LAKE, YOO HOO, EP 2 Mining Division Kamloops
BCGS Map 082L061
Status Prospect NTS Map 082L12W
Latitude 050º 39' 59'' UTM 11 (NAD 83)
Longitude 119º 59' 51'' Northing 5617015
Easting 288181
Commodities Gold, Copper Deposit Types H05 : Epithermal Au-Ag: low sulphidation
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Pooley Lake property lies near the eastern margin of the Intermontane Belt and covers northwesterly striking Upper Triassic Nicola Group volcanics overlain by flat lying Eocene basalts of the Kamloops Group.

Volcanic and volcaniclastic rocks of the Nicola Group dominate the southern part of the property and comprise massive and variably porphyritic andesitic flows, lapilli tuffs and minor sedimentary units. This thick, north to northwesterly trending sequence is cut by a number of feldspar porphyritic syenodiorite and diorite dikes.

A significant amount of brittle fracturing is evident where faulting occurs as well defined single fractures, zones of multiple fractures, breccia zones and areas of pervasive weak brecciation with gradational boundaries. Three dominant fracture orientations control veining and alteration and the average strikes and dips are: 145 degrees dipping 70 degrees southwest; 074 degrees dipping 30 degrees northwest to 20 degrees southeast; and 034 degrees dipping 80 degrees northwest to 80 degrees southeast.

Alteration can be divided into two distinct types: 1) Alteration associated with well defined faults and structural zones. a) Associated with veining - wallrock silicification and carbonate alteration. The type depends largely on vein composition i.e. quartz and/or carbonate. b) Veining weak to absent. Virtually all the fault structures on the cliff face are oxidized to some degree. Most are limonitic, some are strongly hematitic. Many of the stronger structures have associated clay alteration. Structurally controlled breccia zones fall into this category including chloritic and strongly hematitic breccia zones, largely at the Yoo Hoo showing. c) Wallrock silicification adjacent to diorite and syenodiorite dikes. In addition, some dikes have been subject to later fracturing and silicification. 2) Widespread, pervasive alteration. Fairly large areas at the Yoo Hoo and EP 2 showings have been subject to pervasive hematitic alteration which is not clearly related to well defined structural zones. Moderate to strong, pervasive epidote (propylitic) alteration occurs at both showings and is patchy. A core zone of strong alteration and usually moderate fracturing/jointing fades outwards to patchy, pervasive (weak) alteration then veinlet epidote.

At the Yoo Hoo showing, northwesterly trending and steeply dipping structures commonly contain narrow quartz-chalcedony veins with minor carbonate mineralized with local fine arsenopyrite, pyrite and tetrahedrite? These are narrow, between 0.5 and 1.8 metres wide, with much pinch and swell. They can be traced for over 100 metres; vein contacts are sharp with little wallrock silicification. Most of the gold values greater than 3 grams per tonne and up to 14.6 grams per tonne come from these veins (Assessment Report 20016, page 24). Mapping shows a close spatial relationship between these veins and a series of alkalic, dioritic to syenodioritic dikes with similar trend.

Flat-lying structures generally feature narrow, clay alteration zones with or without quartz-carbonate veining in the western part of the showing area. In the eastern part, these zones combined with a large number of other vein structures form a prominent and limonitic gossan. This apparently flat lying alteration/vein zone is over 300 metres long with widespread bleaching obscuring original textures. Vein and fault structures pinch and swell, changing orientation over short distances with numerous truncations. The veins themselves can be quartz and/or carbonate and/or chalcedony. Many tend to be narrow and in swarms. Gold values (up to 3 grams per tonne) appear to be associated with white to grey quartz, not chalcedony.

The EP 2 showing, about 1800 metres east of the Yoo Hoo showing, is dominated by a number of strong, northeasterly trending, poorly mineralized quartz-carbonate vein systems between 1 and 10 metres wide. These veins vary from single veins through stockworks to silicified breccias, and display massive to locally vuggy textures. Milky quartz and carbonate dominate with lesser amounts of banded grey quartz, chalcedony and white barite. Sulphides are generally rare. Wallrock alteration consisting of bleaching, silicification, carbonate, limonitic and/or hematitic alteration may extend for many metres from the veins. Of 68 chip samples taken, only two produced significant gold values with 1 gram per tonne and 0.3 gram per tonne; both samples were 2-metre panel samples from flat-lying veins.

In 1988 and 1989, Corona Corporation conducted geological and geochemical surveys on the property. Rock samples gave a maximum grade of 14.57 grams per tonne gold over 0.75 metres from sample 52647 (Strickland, D. (2017-03-24): NI43-101 Technical Report on the Riverside Property).

In 1990, Corona Corporation conducted an exploration program on the property containing the occurrence that included geological mapping, sampling, and drilling. Rock sampling gave a maximum value of 2.88 grams per tonne gold over 1.0 metres in sample 104501 (Strickland, D. (2017-03-24): NI43-101 Technical Report on the Riverside Property). The drilling found no significant results.

Northern Lion Gold Corp. completed an exploration program on the property containing the occurrence, although results were not reported on.

Bibliography
EMPR ASS RPT 18868, *20016
EMPR PF (General File - Dawson, G.M. (1898): Geology map of Shuswap
Sheet)
GSC MAP 887A; 1059A
GSC MEM 296
GSC OF 481; 637
GSC P 48-4; 74-1A, pp. 25-30; 86-1A, pp. 81-88; 89-1E, pp. 51-60
CJES Vol.21 (Oct.1984), pp. 1171-1193
*Strickland, D. (2017-03-24): NI43-101 Technical Report on the Riverside Property.

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