The Sirdar occurrence is located in an easterly flowing tributary of Bugaboo Creek, approximately 10.5 kilometres north west of the Gordon River mouth.

The area is underlain by the contact of diorite of the Mesozoic and/or Paleozoic Westcoast Complex and a limestone roof pendant of similar age. The deposit consists of a single lens of magnetite containing pyrite disseminations and limestone inclusions, cut by hornblende porphyry and lamprophyre dykes, and enclosed in quartz diorite. Magnetite probably replaced a limestone inclusion.

The magnetite occurs as a massive deposit almost completely surrounded by quartz diorite porphyry. It has a maximum extension in a northwest direction of 38 metres, a maximum width in a northeast direction of 27 metres, and a proven depth of 15 metres to the level of the tunnel. The deposit may have a general north easterly dip.

A sample of the ore gave the following analysis: iron, 56.57 per cent; insolubles, 8.52 per cent; sulphur, 2.75 per cent; phosphorous, 0.121 per cent (CANMET Report No. 47, page 11). Based on the apparent dimensions of the deposit, Young and Uglow (Geological Survey of Canada Economic Geology Series No.3, 1926) made an estimate of the reserves as proven - 9000 tonnes, probable - 8900 tonnes, and possible - 69,000 tonnes.

Work History

In the early 1900’s, two shallow trench-like cuts, stripping and a 31 metre long tunnel were developed on the occurrence.

In 2003 through 2011, Emerald Fields Resource and Pacific Iron Ore Corporation completed various exploration projects in the area as apart of the Pearson Project. These included prospecting, diamond drilling, ground and airborne geophysical surveys, geological mapping and geochemical sampling. Rock sampling, in 2007, of massive magnetite assayed from 63 to 69 per cent iron (Assessment Report 30394).