It is relatively common to find chunks of high grade ore consisting of silver associated with arsenides and sulfides. When Trethewey’s first shipment of silver, containing many slabs of native silver metal, reached the south, people became very excited and a rush to the Cobalt area resulted with claims established all over the area. Rarely as crystals forming octahedra and modified cubes. Whether you’re looking to dig up your own treasures or simply wander around magical crystal shops and gem mines in Ontario, the province of quartz has your back. R. Meilke) (See Figs 34,35,36). (1913) The cobalt-nickel arsenides and silver deposits of Temiskaming (Cobalt and adjacent areas). ___________ (1904) Cobalt-nickel arsenides and silver. In The silver-arsenide deposits of the Cobalt-Gowganda region, Ontario. Comm. There are a number of people that helped or gave me valuable information to make this article more useful and relevant. I walked almost straight to the old Trethewey mine. It is also a great tourist attraction that let in thousands of visitors each year to try their hands at mining amethyst.

Generally, the silver crystallized first with arsenides and sulfides later, with silver (with significant antimony content) deposited throughout the entire depositional period. When the glaciers melted, the pieces of silver vein were dropped and buried along with boulders and ground up rock. Very well crystallized silver that has been etched out of calcite on this specimen. Despite the millions of ounces of silver that have been encountered at Cobalt, distinct crystals of silver are rarely found. Other times, some volumes of dumps have had buildings built on them or collapse on them, making it difficult to dig or use a metal detector. 1:250 000 scale bedrock geology of Ontario. SERGIADES, A.O. Further to the news release of the Company dated October 1, 2019, the Company also wishes to announce that at its last annual general and special meeting of shareholders on September 30, 2019 (the “Meeting”), the Company has received a re-approval of the shareholder rights plan which was originally adopted by the shareholders of the Company on May 8, 2014 (the “Rights Plan”). At that time, one had to go to North Bay by the Grand Trunk, then on the CPR to Mattawa and by the short line to Temiskaming. Fig. Arborescent growths are common, however, and beautiful, branching aggregates of silver are often found, almost always with a coating of nickel or cobalt arsenides that can be thin or so thick as to form the majority of the vein. Has only been found as golden-brown, micro botryoids on annabergite crystals in vugs in massive pararammelsbergite at the Curry Mine near Silver Centre. Langisite The Langis mine was the type locality for this very rare mineral. It is very rare at Cobalt. Metallogenic development of the eastern part of the Southern Province of Ontario, In Summary of Field Work, 1979, Ontario Geological Survey. 63) Nickeline, Silver, Breithauptite, FOV 50mm across, HiHo Mine, Coleman Township. RADCLIFFE, D. and BERRY, L.G. Page generated: November 11, 2016 03:40:49, http://www.geologyontario.mndmf.gov.on.ca/gosportal/gos?command=mndmsearchdetails:mdi&uuid=MDI41I15SE00006. Needles can be up to 3cm long but are usually less than 1cm. Actually, these crystals are twinned “sixlings”. Most specimens consist of massive or disseminated galena with calcite, silver, tetrahedrite and other ore minerals. Most “ruby silver”, at Cobalt, is proustite. 62) Nickeline, Breithauptite, Rammelsbergite, FOV 15mm, Cobalt.  A wonderful example of layered arsenide intergrowth in this sawn section. I am fortunate to have visited this historic area many, many times over the years. (See Figs. As the glaciers moved, they transported the chunks of rock and veins away, “down drift” from the place that they originated. A small outlier of Paleozoic strata is preserved at the north end of Lake Timiskaming. This sawn section is through conglomerate that was adjacent to a silver vein at the O’Brien Mine. They are stored locally on your computer or mobile device. In the following description we refer to these in terms of isometric forms.

The origin of the native silver veins at Cobalt, Ontario. Most stephanite crystals are 0.20 inches in the longest dimension or less however one specimen, M47444, from the Keeley mine in the Royal Ontario Museum collection displays a prominent 26mm crystal. There have been several times when the prices of silver and cobalt have risen enough for mines to be open for periods of time and a few operated on a continuous basis until the mid 1980’s when the last two mines, the Silverfields and Agnico Eagle finally closed. It can also pay to look closely at fragments of calcite/dolomite or at mineralized joint planes, since there could be open spaces containing interesting, albeit, small crystals of some of the more rare or unusual minerals. Sawn slices of this type of high-grade also find use as a lapidary material. The specimen was etched out of calcite/dolomite matrix. This image features larger botryoids of nickeline plus, in front, a pseudomorph of nickeline after some other prismatic mineral. Also the silver-arsenide veins at Cobalt are not unique, they are similar to other epigenetic, hydrothermal five-element (Co-Ni-As-Ag-Bi) vein assemblages found in a number of localities and the spatial association evident at Cobalt with diabase is not typical (Bastin, 1939). Pseudomorphs of arsenide minerals after silver crystals are common. Based on the above observations virtually every rock type that occurs in the area has been proposed as a possible source of the metals and gangue vein material. 59) Nickeline, 2mm crystal,  Rustex (Hudbay Mine), Leith Township (nr. Note the pinkish metallic breithauptite included in the nickeline. Old piece from the Arthur A. Cole collection. Gangue minerals, mostly carbonates, chlorite and quartz appear to be contemporaneously deposited with the ore minerals with a generation of quartz and chlorite often first. ANDREWS, A.J., OWSIACKI, L., KERRICH, R. and STRONG, D.F. R. Mielke, 2015).Â, Johannsenite    Extremely rare.  It has only been found at the Helens-Eplett Mine. (1910) The Davis handbook of the Cobalt silver district with a manual of incorporated companies. When in the presence of significant silver, often tarnishes a bright blue (Pers. (1971) Clinosafflorite: a monoclinic polymorph of safflorite. Fig. DAVIS, H.P. Over 600 million troy ounces of silver have been produced from mines in the area since the first vein was discovered in 1903. From downtown Toronto to Thunder Bay, crystal mines and shops can be found all across the province. 50) At the Keeley-Frontier Mine, a rinkite group mineral is also found as crystals to 0.1mm in the same environment which looks identical to the goethite but can only be distinguished with EDS. Polybasite Polybasite, in small crystals, is often found in the oxidized portions of Cobalt area veins. This is a close-up of one of the parting surfaces shown in Fig. This article will no doubt have some overlap but will also introduce a more personal review of my experience with this fascinating mining and collecting area. 30) Crystals have not been noted. It is sometimes found as white botryoids and crusts of crude micro crystals on honey-coloured scorodite in vugs in weathered loellingite vein material.(Pers. Many of the mineralized veins occur on the upward projection of Archean supracrustal rocks and many are found near volcanogenic base metal sulfide deposits in the Archean basement (Andrews et al., 1986). Although mineralized veins do occur in these faults they are also found to cross cut them and most regional faults are barren. Fig. It has been reported at the Hudson Bay mine (Rustex mine) near Gowganda where it purportedly occurred in superb crystals to 10mm.

79) Silver, 35mm tall, Keeley-Frontier Mine, South Lorrain.

Sometimes in sufficient  amounts to make the calcite look black. Canadian Mineralogist, 11(1), 196-231. Fig. The above list contains all mineral locality references listed on mindat.org.


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