The April occurrence is located about 3.5 kilometres west of Chutanli Lake, approximately 101 kilometres southwest of Vanderhoof.
The showing is hosted by Middle Jurassic Hazelton Group rocks about 1 kilometre north of an east-trending body of Eocene granodiorite. The hostrock is a grey-weathering, thinly bedded tuffaceous limestone that strikes 305 degrees and dips steeply to the northeast. Mineralization consists of a lens or vein of massive to semi-massive sulphide that dips vertically and strikes at 320 degrees. The vein is exposed discontinuously over a 15-metre strike length and varies in width up to a maximum of 1.8 metres. It pinches out abruptly, or is faulted off to the north and is covered by overburden to the south.
Subcrop of narrow quartz-pyrite-chalcopyrite veins occurs along strike to the south. Sulphide minerals present, in order of abundance, are: sphalerite, pyrrhotite, pyrite, galena, arsenopyrite and chalcopyrite.
In 1984, a 3-hole, 157 metre diamond drilling project was conducted by Granges Exploration Ltd. The best assays from diamond drilling were 2.95 grams per tonne gold, 4.0 grams per tonne silver and 0.77 per cent zinc over 0.57 metre; and 1.4 grams per tonne gold, 573.5 grams per tonne silver, 15.96 per cent zinc and 15.83 per cent lead over 0.3 metre (Assessment Report 14281).
In 1996, Orvana reported that the April showing represented an epithermal vein-type prospect. The April showing is approximately 2 metres wide and over 15 metres long.
In the late 1960s and early 1970s, Rio Tinto conducted soil sampling, magnetometer, VLF, airborne electromagnetic (EM) and induced polarization (IP) surveys on their C claims which covered the April (CH) showing area and the C showing (093F 004) area. The IP surveys identified extensive zones of high chargeability (Assessment Reports 2097, 2568, 2683 and 5524). In 1969, Rio Tinto carried out geological mapping, magnetometer and IP surveying over 26 line-kilometres, collection of 1000 soil samples, 7.6 metres of trenching, and 686 metres of diamond drilling. Four zones of high chargeability were found. In 1970, Rio Tinto completed more geological mapping, 84 line-kilometres of IP surveying, and 5 line-kilometres of magnetometer surveying. They also collected 1272 geochemical samples, dug nine trenches, and completed 340 metres of diamond drilling. The soil sampling showed scattered medium to strong copper-molybdenum anomalies and weak lead-zinc-nickel anomalies. In 1971, the assessment work by Rio Tinto included: 316 square kilometres of airborne magnetometer surveying, and 256 metres of surface diamond drilling.
In 1980, on the April and May claims, Granges Inc. collected a total of 389 soil samples which resulted in the discovery of a coincident silver-lead-zinc-copper anomaly and a second more diffuse anomaly to the west. In 1984, Granges diamond drilled three holes totalling 156.67 metres. In 1981, Granges conducted an airborne geophysical survey which did not outline any EM anomalies on the Chutanli Lake project, though several magnetic trends were located.
In 1991 and 1992, regional geochemical till sampling program for Cogema Resources occurred in the vicinity of Chutanli Lake. The samples were variously anomalous in gold, silver, arsenic, antimony, copper, lead, zinc and molybdenum.
In 1990, Placer Dome Inc. collected 248 soil samples, as well as conducting a 3.64 kilometre magnetometer and 3.7 kilometre VLF-EM survey on two grids on their CH claims. The Main grid was located about 1.3 kilometres east of the plotted location of the April showing and the Road grid located about 400 metres northeast of the plotted location of the C showing. The Main grid is just west of the C showing. Both grids contain coincident copper-gold-molybdenum soil geochemistry. Orvana later reported (Assessment Report 25069) that drilling totalled 22 drillholes on the CH property that included the previous drilling by Rio Tinto and newer drilling by Placer (in 1992). This drilling intersected a low grade copper porphyry target. Placer drilling concentrated on IP chargeability high and magnetic high areas. Mineralization consists of up to 5 per cent quartz and quartz-carbonate stockwork with associated magnetite-pyrite-chalcopyrite and is related to various alteration types within volcanic and intrusive rock. Pyrite and chalcopyrite occur in veins and microveins in the volcanics, on fracture surfaces and as fine disseminations in intrusive rocks. Malachite occurs along fracture planes. Copper-gold rich mineralization was intersected in drillholes.
In 1996, Orvana Minerals Corp. collected 111 rocks from their CH property which covered the April and C showings. Orvana reported that the April showing represents epithermal vein-type mineralization. The April showing is approximately 2 metres wide and over 15 metres long.
From 2008 to 2011, four assessment reports were filed by Omega Explorations on behalf Jacqueline A. McLeod on their Porphyry property. Work in the April showing area, and to the east toward the C showing, consisted mostly of soil sampling with minor ground magnetometer and rock sampling. The new prospect occurs in that area between the April and the C showing in the CH prospect area.
In 2011, Ron Bilquist conducted work on his Chutanli 1 to 3 claims where three days were spent prospecting. All old and new logging roads were traversed with the location of outcrops, glacial outwash and till noted. A total of 9 rock samples were taken and 13 geological way points were recorded. Prospecting discovered mineralized float over a presently defined area of about 500 by 250 metres. Finely disseminated molybdenite with minor chalcopyrite was noted in angular chlorite-altered float. One other sample of angular subcrop of chlorite-altered diorite had malachite and possible bornite with anomalous gold.
In 2013, Redhill Resources conducted a drilling program on the Aspen property which consisted of 13 diamond-drill holes totalling 1785 metres of BTW size core. The Aspen property covered much of the CH property area, including the April and C showings. The 2013 drilling program, which in most part targeted untested IP anomalies, confirmed the presence of extensive propylitic (chlorite+/-epidote+/-calcite) and potassic (biotite+/-K-feldspar) alteration zones accompanied by weak copper, silver, gold and arsenic mineralization. Most of the drillholes were put in within 1 kilometre south and southeast of the C showing; one hole was several hundred metres northeast of the C showing. An interval of intensely altered stockwork/breccia from hole A13-6 yielded 0.26 per cent copper, 42 grams per tonne silver and 1 gram per tonne gold over 6.02 metres (Assessment Report 34423).
Redhill Corp. reported (Assessment Report 34423) that anomalies on their properties had been previously tested by 30 holes but the results (except a few 1997 holes (Orvana?)) were not available. Redhill reported that the bulk of historical drilling was done within a zone of copper+/-gold mineralization called the CH zone, which used to be a part of historical CH property. This zone is plotted by Redhill as being 1 kilometre east of the April showing.
Redhill also conducted a program of sampling on their larger claim group. A total of 49 rock, 1461 soil, 62 biogeochemistry samples, and 14 silt samples were collected. The focus of the 2013 sampling program on the Aspen property was an area between Chutanli and Brewster lakes. The 2013 sampling program detected three soil anomalies.