But as a package of about seventeen rare lands occurs naturally in combination with constant proportions in their deposits, miners will inevitably create an expanding oversupply of several other elements in their career to increase Nd and Pr production. Therefore, special attention should be paid, paid to the variable to attract clients for each of these elements when assessing the economic viability of each of the mining projects, since not all infrequent lands will likely gain advantages from the transition to a sustainable global economy.
An advent at the ‘basket problem’
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