BRIEF-Collahuasi cuts costs 23 pct in H1
SANTIAGO, July 20 (Reuters) -
* Chilean copper mine Collahuasi cuts costs 23 pct in first half year-on-year to $1.18 per pound, mine head Jorge Gomez says
* Production rose 12.6 pct to 243,838 tonnes
* Mine is joint venture between Anglo American and Glencore (Reporting by Fabian Cambero)
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