1.4 Pre-construction investigations e.g. bore houses, soil testing Yes Exploration for estimation of coal reserves has already been done by GSI and DGM, Jharkhand through outsourced agencies. Detailed soil investigations will be done before start of construction of any buildings. 1.5 Construction works.The U.S. coal industry serves a vital role in the nation’s economy by producing fuel for than half of its electricity. Despite the industry’s importance, industry financial data for 2005—the strongest year for the coal industry in recent years—shows that it is a relatively small industry with revenues totaling $20 billion to $25 billion and net income between $1 billion and $2.