The Coniagas #4 Shaft, located at the intersection of Prospect Avenue and Silver Street, reached a depth of 350 feet ( 110 meters ). Connected to the main Coniagas Mine site by underground tunnels, the downtown shaft had the distinction of being across the street from the newly-formed Royal Exchange, which later moved and became the Toronto Stock Exchange.

     In May 1915, Cobalt agreed to let Coniagas erect a trestle over Silver Street from its shaft on Lot 287 to a vacant area just north of the fire hall. The trestle was to be at least 19 feet high and its sides sheathed for the protection of those below. Coniagas “accepted the proposal as long as the town did not interfere with its mining operations until such time as the said Mine exhausts the other places East and North of the said buildings.” The first ore passed above Silver Street in July 1915, three years after the Coniagas Shaft #4 reached a depth of 110 meters.

     Two years after, in 1924, the company ceased operations. Anthony Giachino then purchased the shaft house and converted it into a grocery and meat market. He utilized the rising cold air in the shaft to cool the meat and vegetables and to air-condition the store. The building has gone through several owners, and many uses, since then. White Mountain Publications was the last to occupy the ground floor of this historic building.

The shaft itself was filled with concrete in November 2015 for the safety of all concerned.

GPS Co-ordinates: 47.396481′, -79.685993′