The Southeast zone occurrence is located between Moffat and Woodjam creeks, to the east of the Takom occurrence (093A 206) on the northeast corner of the Woodjam South property, approximately 17 kilometres south of Horsefly and 65 kilometres northeast of Williams Lake.
The Woodjam South property is overlain by widespread Quaternary glacial deposits and underlain by extensive olivine-phyric basalts that have been correlated with the Miocene Chilcotin Group. The basalts overlie Nicola Group rocks consisting of up to 50-metre-thick sequences of consolidated to unconsolidated volcanic-derived sedimentary rocks including sandstones and conglomerates. The Southeast zone occurrence is hosted within the Takomkane Batholith. The batholith is a large, Late Triassic to Early Jurassic, predominantly calc-alkalic granitoid intrusive with an area approximately 35 by 50 kilometres at the surface. The intrusive is one of a series of at least six large, coeval plutonic bodies including the Guichon Batholith, which hosts the Highland Valley copper deposit, and the Granite Mountain Batholith, which hosts the Gibraltar deposit.
Mineralization in the Southeast zone is characteristic of porphyry-style copper-molybdenum±gold deposits associated with calc-alkaline intrusive rocks. The mineralization is related to moderate to strong potassic alteration and is dominated by copper, with minor molybdenum and rare gold. Most of the copper and almost all the molybdenum are hosted in a series of stockwork, sheeted and individual veins and vein sets. Chalcopyrite±pyrite stockwork veinlets are an important copper host. Disseminated chalcopyrite±bornite also occurs within the hostrock. Copper is hosted mainly in chalcopyrite, with minor bornite and very rare trace chalcocite, covellite and local tennantite.
The Southeast zone consists of texturally variable quartz monzonite to granite intrusive units including aplite dikes, all crosscut by plagioclase porphyry and basalt dikes. All units except the basalt dikes display varying degrees of hydrothermal alteration. Mineralization is hosted by the Takomkane quartz monzonite units and the aplite dikes. The mineralized zone consists of two northeast-southwest–striking, higher grade (greater than 0.5 per cent copper) zones dipping 45 to 60 degrees to the northwest, parallel to the hostrock orientation. Mineralization is bounded in the north by a major northeast-southwest–trending structure.
Exploration first began in the area in the 1800s. In 1988, Circle Resources Limited carried out soil and rock sampling over the Wood property, now located in the northeast corner of the Woodjam South eastern block. In 1998, Wildrose Resources Limited (now known as Cariboo Rose Resources Limited) staked the first Woodjam claims on what is now the Woodjam North property. The following year, the property was optioned to Phelps Dodge Corporation of Canada Limited, who further expanded the property. In 2001, Cariboo Rose granted Fjordland Exploration Incorporated a 60 per cent option on the property, forming the Woodjam joint venture. In 2003, H.J. Wahl carried out an enzyme leach soil survey identifying an oxidation anomaly coincident with an airborne magnetic anomaly in the Cossack Lake area. Fjordland Exploration staked additional ground surrounding the existing claims in 2006, effectively doubling the size of the property.
In 2007, Fjordland and Cariboo Rose carried out induced polarization, resistivity and ground magnetic geophysical surveys, expanding the existing grids to the south and outlining a large induced polarization chargeability anomaly. Drill testing of the anomaly led to the identification of the Southeast zone mineralization. Four drillholes were completed totalling 1157.07 metres. Work on the Southeast zone continued in 2008 with induced polarization chargeability/resistivity geophysical surveys to infill and extend the Southeast zone anomaly and the completion of 14 diamond drill holes on the Southeast zone totalling 6096 metres.
In 2009, the Woodjam property was divided into the Woodjam North and Woodjam South properties. Gold Fields Horsefly Corp. optioned the Woodjam North property, followed by the Woodjam South property in 2010. The property is now jointly held by Gold Fields and Woodjam Copper Corporation, an amalgamation of the Woodjam interests held by Fjordland Exploration and Cariboo Rose Resources Limited. Minor exploration was completed on Woodjam South in 2009 as part of the Gold Fields Woodjam North exploration program. An airborne magnetic geophysical survey over Woodjam North overlapped parts of the Woodjam South property and three rock samples were collected from Woodjam South, but they did not return any significant results. In 2010, Gold Fields began exploration on Woodjam South, completing 71 line kilometres of line cutting, 33 line kilometres of an induced polarization geophysical survey, 30 line kilometres of ground magnetic geophysical survey, 744 soil samples plus 78 selective extraction samples over the Southeast zone, six silt samples, 33 rock samples and 20 diamond drill holes over the Southeast zone, as well as geological mapping across the Woodjam North and Woodjam South properties.
Exploration in 2011 consisted of ground magnetic, airborne magnetic and gravity geophysical surveys and a 57-hole drill program totalling 17 195.57 metres. A 42-hole infill diamond drill program focused on the mineralization in the Southeast zone. Results from the drilling confirmed the presence of continuous copper-molybdenum±gold mineralization and enabled the completion of a geological model and an estimation of inferred mineral resources. Additional exploration on the property included three unsuccessful reverse circulation drillholes and 12 diamond drill holes located around and to the south of Cossack Lake. An airborne magnetic survey was flown over parts of the Woodjam South property and a gravity geophysical survey was completed over the Woodjam North and Woodjam South properties.
The best results obtained by Fjordland and Cariboo Rose during 2007 drilling were from drillhole WJ07-79, returning 155.8 metres of 0.36 per cent copper (Sherlock, Poos & Trueman, 2012). Significant results obtained by Gold Fields from 2008 and 2010 drilling include 313.12 metres averaging 0.76 per cent copper and 0.3 gram per tonne gold from drillhole WJ08-84, 163.86 metres of 0.62 per cent copper from drillhole SE10-14 and 227.06 metres of 0.3 per cent copper from drillhole SE10-01 (Sherlock, Poos & Trueman, 2012). Significant results from 2011 drilling include 218.79 metres of 0.48 per cent copper from drillhole SE11-25, 309.48 metres of 0.34 per cent copper from drillhole SE11-31, 176.98 metres of 0.51 per cent copper from drillhole SE11-51 and 124 metres of 0.71 per cent copper from drillhole SE11-61 (Sherlock, Poos & Trueman, 2012).
In March 2012, Gold Fields released an inferred resource estimate of 146.5 million tonnes at 0.33 per cent copper for 480 807.91 tonnes of copper for the Southeast zone. The resource estimate was based on an open-pit constrained model and cutoff grade of 0.16 per cent copper (www.woodjamcopper.com). An updated resource estimate released in May 2013 gave an expanded inferred resource estimate of 227.5 million tonnes at 0.31 per cent copper for 699 394.08 tonnes of copper (Press Release, Consolidated Woodjam Copper Corporation, May 15, 2013).