求翻译：中煤第五建设有限公司第三工程处承接施工的山东会会宝岭铁矿主井，其揭露的岩石为坚固的黑云变粒岩，普氏系数f=21.3。是什么意思？

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In the first 5 coal-building agency to undertake limited 3 construction works of the Shandong iron ore pits will be Po-ling, the exposed rock solid rock, the black cloud changed tablets Platts coefficient F = 21.3 .

The coal fifth construction limited company third engineering department contract construction Shandong meeting can the valuable range iron ore host well, its exposition rock for the firm black cloud granulite, Pope coefficient f=21.3.

China coal Construction Ltd v the third agency to undertake the construction of main shaft of Bao-Ling iron ore in Shandong province, which reveal the dark cloud of rock solid granulite, Pu's coefficient of f=21.3.