Exploration at the Rainy River Gold Project started as early as 1967, with Noranda, International Nickel Corporation of Canada, Hudson’s Bay Exploration and Development and Mingold Resources operating in the area to 1989.
The Ontario Geological Survey conducted geological mapping in 1971 and again in 1987 to 1988 in conjunction with a rotasonic overburden drilling program. Nuinsco started exploring the area between 1990 and 2004. In June 2005, Rainy River acquired a 100% interest in the project from Nuinsco.
Nuinsco drilled a series of widely spaced reverse circulation (RC) drill holes from 1994 to 1998, defining a fifteen kilometre long “gold-grains-in-till” dispersal train emanating from a thickly overburden-covered, six square kilometre "gold-in-bedrock" anomaly. Nuinsco completed a series of diamond drill programs to assess the mineral potential of the anomalies which led to the initial discovery of the 17 Zone in 1994.
Upon acquisition in 2005, Rainy River Resources relogged key sections of the historical core drilled on the property, and then entered all of the data into a GIS database.
The Company subsequently drilled over 100 RC holes in three phases to better define the “gold-in-till” and “gold-in-bedrock” anomalies.