Machines used are water pumps, sand pumps or ore pumps. Mines are of two kinds – ordinary ground mines and hard rock mines, and mining can be done mechanically or manually.
That lake is the origin of the Inngyi Lake that could be seen now in the middle of Mogok. But, unfortunately, in 1925, the dugout collapsed, flooding all mines in the valley and causing a big lake to emerge. Gemstone mines in the Mogok valley, which could be dug only 20 feet in the past, could then be dug 100 feet deep. The underground canal plan was implemented in 1906. Thus, one can imagine how extensive the mining business was in those times.
The plan was to contain the flooding issue in the mines, and to have excess water from the valley region flow through the canal to a low-lying Yay Ni stream near Kyauk Htat Gyi. Morgan, the company’s chief engineer, submitted an underground canal plan 100 feet below the Mogok valley ground surface, with seven feet high, seven feet wide and over one mile long dimensions. In 1889, during the British rule, the Burma Ruby Mines Company was established, and with an investment of 150,000 pound sterling value at that time, ruby mining was extensively undertaken.
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