Pages from a sketchbook: The Daily images (15 Jan’ 2015)

Despite the preponderance of gold-mining and railway-themed illustrations that appear on this site,  I have been known to draw other things, especially aircraft. Herewith an example.

AIRCRAFT

DSCF2808

ON-MARK B-26K ‘INVADER

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GOLD MINING

11. A CALIFORNIAN 5-STAMP BATTERY...DSCF3393 (2)

‘A ‘CALIFORNIAN’ TYPE  5-STAMP BATTERY AS USED ON N.Z. GOLDFIELDS’. 

In most of the Coromandel Peninsula’s batteries (reduction-works), the stamper battery was the key to success.   The battery  invariably  operated in  groups of five (as illustrated).* Heavy weights (the ‘Stamps’),  operating  in a pre-programmed sequence and set at  the optimum height for the purpose, crushed the gold-bearing quartz-rock to talcum-powder fineness, releasing  the gold there-in for further chemical processing.

* Confusingly, in Australasia, the term ‘Battery’ was / is used to describe both the crushing  machinery (as illustrated), and the building / site where these machines were located.

Michael Keith

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Pages from a sketchbook: The Daily images (15 Jan’ 2015)

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