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280

Centuries: 2nd century - 3rd century - 4th century

Decades: 230s 240s 250s 260s 270s - 280s - 290s 310s 320s 330s 340s

Years: 275 276 277 278 279 - 280 - 281 282 283 284 285


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Bioleaching

... is now separated from the ore and in solution. The process for copper is very similar. The mineral chalcopyrite (CuFeS2) follows the two stages of being dissolved and ...