[6964f] ^Download~ Mining and Scientific Press, Vol. 124: January to March, 1922 (Classic Reprint) - Unknown *ePub^ Online

[6964f] ^Read^ Mining and Scientific Press, Vol. 124: January to March, 1922 (Classic Reprint) - Unknown *ePub^

Excerpt from Mining and Scientific Press, Vol. 124: January to March, 1922In 1890 mining and metallurgical processes were most imperfect, the appliances for handling material were crude and inadequate. For such reasons the output of a man per day was exceedingly limited and it required ores containing copper, which even then were becoming exhausted, -to produce the metal

Title : Mining and Scientific Press, Vol. 124: January to March, 1922 (Classic Reprint)
Author : Unknown
Language : en
Rating :
4.90 out of 5 stars
Type : PDF, ePub, Kindle
Uploaded : Apr 15, 2021
Book code : 6964f

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