![](http://www.alamy.com/thumbs/6/B6A1C8C8-E0F6-4467-BB4D-FD3A937C9A07/HC0THX.jpg)
Image taken from page 422 of 'Economic Mining. A practical handbook for the miner, the metallurgist, and the merchant' Image taken from page 422 of 'Economic Mining A practical
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