Lithium looks set for a period of steady demand growth Does Sigma Lithium Resources Corp (CVE:SGMA) will have the greenest large-scale mining development project in the world? It just might. The Grota do Cirilo project in Brazil has several things going for it. First off, it’s the largest hard rock lithium deposit in the Americas. Second, all mining and processing will use clean hydro-electric power. Third, 90% of the water that’s used in the processing plant will be recirculated back into the operation. Fourth, no hazardous chemicals are used to separate the lithium from the host rock. And fifth, if ongoing discussions are eventually successful, a significant portion of the resultant dry stack tailings will be recycled into the ceramics industry.