Premier Gold Mines Limited
Brookbank


Location

The Brookbank property is 14 km northeast of the town of Beardmore. By road, it is approximately 14 km east of Beardmore along the TransCanada highway and 12 km north of the highway by gravel road. Beardmore is about 205 km by highway northeast of the airport in Thunder Bay, Ontario.

Size of Property

682 mining leases and staked claims

Ownership

100% on the 18 leases that comprise the Brookbank Deposit


The rest of the property is subject to two JV agreements with Metalore Resources.
PG 74% Metalore 26%
PG 79% Metalore 21%



Project Overview

The project area includes the Brookbank, Cherbourg, and Foxear gold deposits and the Irwin prospect. A 2009 report by Scott Wilson Roscoe Postle Associates Inc. estimated gold resources in the Brookbank, Cherbourg, and Foxear deposits as shown in the table below (Blakley and Moreton, 2009).

Deposit

INDICATED

INFERRED

Tonnes

Grade (g/t)

Ounces

Tonnes

Grade (g/t)

Ounces

Brookbank

1,217,400

8.8

345,600

813,000

7.4

192,800

Cherbourg

79,900

10.1

25,900

141,200

8.1

37,000

Foxear

34,500

4.3

4,700

54,200

3.7

6,500

Total

 

 

376,200

 

 

236,300


Claims at Brookbank were staked in 1934 but first drilled in 1944. Additional drilling and geophysical work occurred in the 1970s and 1980s (Mason and White, 1986). In 1999, Ontex commissioned an airborne magnetic, electromagnetic, and radiometric survey of the Brookbank project and its extensive properties to the east and west. Drilling by Ontex of the Brookbank, Cherbourg, and Foxear deposits from 1999 to 2008 culminated with the 2009 resource estimate. Drilling continued in 2009.

Although most samples from the Brookbank deposit have grades less than 15 g/tonne (0.44 oz/st), there are rare high-grade intercepts such as 59 g/tonne (1.7 oz/st) over a drilled length of 3.4 m (11 feet) in BB-09-10 and 86 g/tonne (2.5 oz/st) over a drilled length of 3.4 m (11 feet) in BB-08-10.

Geology

The Brookbank project is located within the Beardmore-Geraldton greenstone belt of the Wabigoon subprovince of the Superior province. The three identified gold deposits are located in mafic metavolcanic rocks just south of the fault separating the northern metavolcanic sub-belt from the northern metasedimentary sub-belt. In the project area, the metasedimentary sub-belt is only about 0.5 km wide and the metavolcanic sub-belt is 1-1.5 km wide (DeWolfe, Lafrance, and Stott, 2007).

In the project area, the metavolcanic rocks are primarily metabasalt flows with common pillows. Coarser grained mafic rocks may be gabbroic intrusions or thick flows. Minor tuffs are also present.

Rocks of the northern metasedimentary sub-belt are primarily polymict metaconglomerate with pebble to boulder-size clasts of mafic and felsic igneous rocks, quartz, and iron formation.

Mineralization

Gold in the Brookbank deposit occurs in quartz-carbonate veins and altered rock within the Brookbank shear zone and in metabasalt in the immediate hanging wall (south). Ankerite is the most common carbonate in the mineralized zone. Metasedimentary rocks north of the shear zone are not altered and do not have gold. Gold is associated with pyrite in both the veins and the altered wall rock. Alteration includes ankerite flooding (also with chlorite, sericite, and epidote), silicification, and quartz-orthoclase-pyrite alteration. Accessory minerals include arsenopyrite, sphalerite, galena, chalcopyrite, and silver tellurides (DeWolfe, Lafrance, and Stott, 2007).

References

Blakley, I.T. and Moreton, C., 2009, Technical report on the Brookbank gold deposit, Beardmore-Geraldton area, northern Ontario, Canada: Scott Wilson Roscoe Postle Associates Inc. Report for Ontex Resources Limited.

DeWolfe, J.C., Lafrance, B., and Stott, G.M., 2007, Geology of the shear-hosted Brookbank gold prospect in the Beardmore-Geraldton belt, Wabigoon subprovince, Ontario: Canadian Journal of Earth Science, v. 44, p. 925-946.

Mason, J. and White, G., 1986, Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane: Ontario Geological Survey, Open File Report 5630.

Maps


Brookbank Deposit
 

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