"We're at the spot where each engineer is personally responsible for at least a million users," and growing, he says, tracing an upward line in the air.

In practicing of blasting , Engineer of blasting design the scheme and parameter of blasting by the personal experience , project analogy and testing on analogical spot at present.

The engineer advised him to continue digging in the same spot where the former owners had left off. And three feet deeper, the new owner struck gold.