1866

Gold is discovered in a cave on a farm owned by John Richardson just north of Madoc. The Madoc gold rush begins.

1866-1867

Mining begins at Deloro. Gold-bearing ore is bound up with arsenic. A smelting process is required to separate the gold and the arsenic.

1873

Several claims around Deloro organized into the Gatling/Gold and Silver Mining Company and a new mill is built.

1880

Canada Consolidated Gold Mining Company acquires Deloro property.

1882

The "arsenic works" (a new 10-stamp mill, dry crusher, and chlorination building) is erected on the banks of the Moira River. The mill uses a chlorination process to separate the gold from the arsenic.

1892

Hastings Mining and Reduction Company operates the Deloro site briefly.

1896

Canadian Goldfields Ltd. acquires site.

1898

Successful research and development of white arsenic production using bromo-cyanide. A new mill, cyanide plant and laboratory are built.

1899

Atlas Arsenic mine begins development of the Five Acre Site north of the main Deloro development but only operates for four or five years. By 1901 the company builds a 10-stamp mill with a 10-drill air compressor plant, shaft houses, blacksmith shops, repair shops, office, and other mine buildings.

Smelting Silver, and Cobalt (1903-1909)

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