In the State of Sonora, there are many operating open pit, bulk tonnage gold mines in production; La Herradura, Piedras Verdes, Noche Buena, Mulatos, El Chanate, Santa Elena, San Francisco, El Chanate, La Caridad, Cananea, Milpillas, Cerro Colorado and Alamo Dorado (and many more).

All of operating mines mentioned above had histories of historical artisanal mining of high grade vein systems prior to modern exploration. By applying current day exploration techniques in these areas, these miners have discovered much larger mineralized systems which were then mined by bulk tonnage, open pit methods.

Colibri Resource Corporation has also experienced modern exploration successes on its own highly mineralized properties (with historical mine sites) and intends to further explore and grow the potential mineral resources of these projects to a point where development decisions can be made.