Emerald Gem Mine - The Emerald Mine of Little Switzerland
At present, the mining process to extract Muzo emerald stone - Colombia, is carried out in five different galleries. The four vertical mines include Catedral, Tequendama, Puerto Arturo and Volvere. Out of these four, Puerto Arturo is the oldest gallery. The fifth gallery is La Rampa which is spiral-bored, and, it is 1,300 feet underground.