Developing Lingman Lake
Lingman Lake possesses significant geological characteristics of gold environments that are common with contemporary models of Archean lode gold greenstone belts, including:
Regional scale deformation zone.
Gold-enriched quartz veins and silicification alteration zones and shear zones.
Multiple sub-parallel and branching shear zones over a wide area, extending along a strike length in excess of 1,000-meters and 260-meters in width.
Multi-phase intrusions ranging from regional scale granitic terranes to property level feldspar ± quartz porphyry.
Poly-sulphide mineralization that includes; pyrite, arsenopyrite, chalcopyrite, galena and sphalerite.
Multi-environment gold mineral associations that include; gold in silicification zones, quartz veins and veinlets, in metavlocanic-intrusive contact proximal zones, and within intrusive rocks.
Only 20% of the property (McPhee 1989) reported to have been subjected to detailed exploration.
Bulk sample assay results significantly higher than core sample assays. Bulk samples averaged at 17.3 gpt (0.51 opt) versus McPhee average from drilling of 6.86 gpt (0.20 opt)!
Depth potential illustrated by 1973 hole drilled to 302-meters (992-ft) intersecting the North Zone; returned an assay from 283.5-285.0-meters, (930.1-935.0 ft) a 1.5-meter (4.9 ft) interval grading 325.7 gpt gold (9.50 opt), (Crouse 1973).
The property is situated in the Lingman Lake greenstone belt., consisting of a complexly folded assemblage, of mafic metavolcanics, felsic metavolcanics and metasedimentary rocks. The assemblage is in intrusive contact with marginal granitic rocks and internally intruded by various intrusive rocks.
Gold mineralization at the Lingman Lake mine occurs in multiple zones; which are structurally controlled by sub-parallel shears. Within these zones, the most favourable host rocks are mafic volcanics that have been silicified and carbonatized and occur in proximity to feldspar ± quartz bodies that are up to 91-meters wide. Intrusive-volcanic contact domains display the best gold mineralized systems e.g. North zones ‘A’ and ‘B’, and Central zone ‘A.’ Inter-intrusive mineralized zones host the weakest gold mineralization. Distal contact domains display variable gold mineralization but can form important systems, e.g. South zones ‘A’ and ‘B’. Where these zones bifurcate or branch the alteration vein-envelopes attain their widest widths in some cases exceeding 17-meters-true width, especially in the North zone.
Click picture to enlarge
The Lingman Lake greenstone belt has been prospected since the mid to late 1930s, and it was in this interval that gold mineralized veins were discovered in the area of what was to become the Lingman Lake Gold mine. Lingman Lake Gold Mines Limited was incorporated in 1945 and secured patent status to the claims the company was developing, which culminated in a 3-compartment 131-meter deep shaft which serviced 3-levels, on a resource base of 69,000oz of gold. Between 1987 and 1989 approximately 28,000-meters of diamond drilling were completed on the property which served as the base from which the most recent historic estimate was derived.
Signature Resources consolidated its acquisition of the property in the fall of 2013 and since then has filed a National Instrument 43-101 Report which can be viewed on the company’s profile on SEDAR website. www.sedar.com
History of Lingman Lake
Overall, the significant gold grades from diamond drilling for the zones are variable, ranging from 3.97 gpt over 2.63-meter true width (11650N Zone) to 9.25 gpt over 2.59-meter true width (North Zone ‘B’). Gold grades from underground bulk samples (4 x 500 lb samples) extracted in 1948 ranged from 9.5 gpt to 22.1 gpt. Sulphide content varies from 1% to 15% and includes; pyrite, pyrrhotite, arsenopyrite, chalcopyrite, galena and sphalerite. Pyrite is the dominant sulphide and locally high gold values have been reported to be associated with arsenopyrite. Zones of intense silicification with minor pyrite also contain high gold values. Visible gold is rare but has been observed.
Lingman Lake Gold Zone
NORTH ZONES: 670-meters long (2,19 ft), open along strike. Test to 183-meters (600ft) open beyond this depth.
CENTRAL ZONES: 490-meters long (1,607-ft) tested by surface and underground diamond drilling. Sampled underground on the 150L and 275L. Furthest eastward drifting on 275L for 91-meters (300-ft).
SOUTH ZONES: 670-meters long (2,198-ft). Tested by surface diamond drilling. Open at depth and along strike.
WEST ZONE: 370-meters long (1,213-ft) tested by surface diamond drilling. May represent westward continuation of North Zone.
11650N ZONE: 200-meters long (656-ft) Open at depth.
Within the Lingman Lake mine project area, the North Horizon contains four high-priority targets defined by the recently completed airborne geophysical survey. All of these targets extend along a 3,500 meter length in a northwest trend, west of the Lingman Lake gold zones.
See map on Lingside West project page.