The Silver Crown showing is located 1 kilometre northeast of the Kitsault River, 30.5 kilometres north-northwest of Alice Arm.
This showing is hosted in altered plagioclase-hornblende porphyritic andesite, with minor interbedded black siltstone/argillite, informally known as the "Copper Belt", of the Lower Jurassic Hazelton Group. The porphyry is thought to be the intrusive equivalent of the felsic Mount Dilworth Formation (Hazelton Group).
The showing consists of 0.3 to 0.6 metre wide shear zones and quartz veins striking 070 degrees and dipping steeply north. These contain stringers, 5 centimetres thick, of stibnite, arsenopyrite, tetrahedrite, galena, pyrite, sphalerite and chalcopyrite. A grab sample of a quartz vein assayed 15.4 grams per tonne gold and 7241.14 grams per tonne silver (Assessment Report 16034, page 16). A grab sample of selected galena ore from a shear zone assayed 19.9 grams per tonne gold, 1370 grams per tonne silver, 15.1 per cent lead and 3.0 per cent zinc (Minister of Mines Annual Report 1930, page 100).
Previously documented occurrences: Camp zone, Cascade Falls (103P 211), Lucky Strike (103P 077), Silver Crown (this description), Lucky Strike North (103P 074) showings, Iron Kitsault (103P 165) zones are referred to collectively as the Dilly and Dilly West zones by Teck. Teck has not indicated the exact location of the Dilly and Dilly West zones, or which documented occurrences belong in which zone.
The Dilly West zone has been traced on surface for 600 metres in strike length to 2001. It consists of well laminated silicified mudstones and siltstones directly below the debris flow unit. Showings include massive sulphides stratabound within silicified mudstones, massive arsenopyrite lenses, also stratabound, and sedimentary diatremes feeding into this stratigraphy.
The Dilly zone to 2001 has a longer indicated strike length of 1.5 kilometres and also remains open in both directions. A diverse range of mineralization occurs along a discrete horizon which is stratigraphically located 50-100 metres below the Dilly West zone. Hostrocks are again silicified mudstones and siltstones. Styles of mineralization include massive sulphide base metal showings, semimassive to massive arsenopyrite showings, massive, laminated galena-sphalerite showings and sulphide stockworks within felsic volcanic pyroclastics. At the northern end of the zone, silicification decreases in the sediments and the showings become base metals associated with massive to semimassive barite.
From 1914 to 1939, discovery of a number of gold showings on the Cambria claims resulted as a spinoff from exploration on the nearby Homestake, Vanguard and Vanguard showings. From 1964 to 1979, local prospector Dwight Collison put in extensive time working a number of the showings and staked the entire area. From 1979 to 1980, Newmont Canada optioned the property from Collison and put in a grid, for magnetic and Max-Min geophysical surveys as well as geological mapping and rock and soil collection. From 1986 to 1988, the open ground was staked by S. Coombes and D. Nelles and was optioned to Cambria Resources Ltd. They conducted geological mapping, rock sampling, blast trenching, and induced polarization (IP) and resistivity geophysical surveys. From 1989 to 1991, Noranda optioned the property and established a grid, and collected extensive silts, soil and rock samples. They also conducted geological mapping and magnetic, IP and resistivity surveys followed up by twelve diamond-drill holes. In 2000, the reduced Cambria claims held by S. Coombes were optioned by Teck Corp.; Teck staked the balance of the property. An orientation geological survey was conducted to examine numerous occurrences and to determine the geological environment. In 2001, Teck mapped the property and collected 686 rock samples for analysis.
In 2003, Bravo Venture Group Inc. acquired the Homestake Ridge and focused its drill program primarily on structurally controlled gold mineralization (103P 216) in the Goldslide pluton rather than exploring for a precious metal enriched volcanogenic massive sulphide (VMS) deposit as Teck Cominco Ltd. had. Six holes tested a zone of quartz-pyrite stockwork veining and breccia at the contact of the feldspar-hornblende porphyry stock. Bravo drilled five additional holes to test four other targets: the rhyolite–argillite contact formerly explored by Teck Cominco, the Silver Crown zone (103P 082), and the Fox-Gold Reef zone (103P 093, 213), and the Dilly vein. No significant assays resulted.
During the 2004 field season, Bravo focused on delineating the strike potential of the main Homestake shear. Ten line-kilometres of cut grid were established over the main and adjacent structures. Soil sampling and ground magnetic geophysics were conducted over the grid. Several zones of interest were identified mapped and sampled. In 2005, Bravo returned to the Homestake Ridge gold prospect (103P 216) to complete 1643 metres of drilling in 11 holes, intersecting significant gold-silver values.
During 2017 through 2019, Auryn Resources Inc. completed programs of geological mapping, geochemical (rock and soil) sampling, airborne and ground geophysical surveys and re-logging of historical drill cores.
