Tatizo kwenye hii ishi kila mtu anajifanya yeye anaelewa sana hujusu madini. Huyo prof alishauri jambo zuri sana ilitakiwa wachukue sample wakapime maabara ili waje na majibu kwamba ni copper concentrate au ni mchanga wa dhahabu tena kwa concentration ya kiwango gani. Lakini pia tanzania na...
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