Informal methods of gold production, known as "artisanal" or small-scale mining, have grown rapidly in recent years as demand for gold has boomed, pushing prices higher.
Barrick must either firm up its proposal to acquire the 36.1% of Acacia it does not own by June 18, or walk away for at least six months under British takeover law.
Though traditionally slow in adopting technological innovations, miners are increasingly adopting blockchains and smart contracts as a source of productivity and transparency gains.
Discovery comes on the heels of a government's study showing the miner's Cascabel project will be one of the world’s ten largest copper, silver and gold mines.