The area of the Reko occurrences is mapped by Muller (Geological Survey of Canada Open File The Reko North occurrence is located on a ridge in the north easterern head waters of Hemmingsen Creek, at approximately 750 metres in elevation.
The area is mapped by Muller (Geological Survey of Canada Open File 821) as primarily diorite of the Mesozoic and/or Paleozoic Westcoast Complex. An east trending band of limestone is also mapped. Volcanics of the Lower Jurassic Bonanza Group occur to the north of the Reko property.
The north part of the Reko property is underlain by grey to white crystalline limestone, and the central and south part is underlain mainly by intrusive breccia. Several bodies of limestone also occur in the central and south part. The primary fragments of the breccia are fine grained and dark grayish green in colour, resembling andesite, and some contain amygdules. This andesitic rock was successively intruded by mafic-rich and mafic-poor diorite. The breccia grades to massive, mesocratic diorite to the south, and to massive andesite at about the 600 metre level on the west side of the east ridge. A set of long, narrow, fine-grained grey dykes strike 020 degrees and transects all other rocks. Most limestone bodies have been successively intruded by dykes of andesite and leucodiorite. It is thought that prior to diorite intrusion andesite underlay the limestone and also intruded it.
Four zones make up the Reko North occurrence.
1.) Zone 9 is a body of pure magnetite emplaced directly in limestone. It is exposed over an area of about 8 by 15 metres. Magnetite float continues uphill almost to the crest of the ridge. About 60 metres northeast of Zone 9, a vein of massive magnetite 50 centimetres wide dips 70 degrees southwest in the limestone; the exposed length is a few metres. To the southwest a 120 centimetre lens of massive magnetite dips 70 degrees east-northeast.
2.) Zone 10, about 350 metres to the west-northwest of Zone 9, is a narrow zone of outcrops of mostly pure magnetite. Downslope it appears to finger out among andesite dykes, but mostly the walls appear to be limestone. The width appears to range from 3 to 15 metres, over a length of inferred continuity of 75 metres. A small magnetite showing occurs 200 metres upslope.
3.) Zone 11, about 300 metres west of Zone 10, consists largely of garnetite, which contains pockets and narrow bands of magnetite. The upper part has an estimated width of 45 metres and a slope length of 120 metres.
4.) The Mag (P-12) zone consists of massive magnetite exposed in a stream bed over approximately 5 metres. Pyrrhotite and chalcopyrite occur near a contact with skarned mafic (gabbroic?) intrusion. Sulphide mineralization decreases down slope, away from the skarn contact. The skarn assemblage is epidote and actinolite(?). The contact between mineralization and skarn dips to the south east at 30 to 35 degrees. In 2008, 6 of 7 samples from the zone assayed from 53 to 55 per cent iron, along with one sample (B279953) that assayed 2.53 grams per tonne gold (Assessment Report 30394). In 2009, four diamond drill holes, totalling 1,283.26 metres, were completed on the zone. The best intersection was from Hole 9-11-G (sample G985502) which assayed 15 grams per tonne silver, 0.0877 per cent zinc and 8.7 per cent copper over 0.42 metre of skarn-altered dike rock with epidote, garnet, pyroxene, and vesuvianite (?) with about 35 per cent chalcopyrite rich sulphide in patches, bands and minor veinlets (Assessment Report 31531).
In 1975, Reako Explorations Ltd. reported an ore reserve estimate on the Reko property (see Reko 3 -- 092C 090, Reko 38 -- 092C 110 and Reko 10 -- 092C 091) of 4,500,000 tonnes grading 22 per cent iron (George Cross News Letter No.207, 1975).
In 2003 through 2010, 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.
