Resultados de búsqueda - "artisanal method"

Uboreshaji wa shughuli za uchimbaji mdogo wa madini nchini Tanzania kupitia ubia na wawekezaji: Fursa na changamoto por Schoneveld, George C., Chacha, M., Njau, M., Weng, X., Jonsson, J.

Materias: “…artisanal method…”
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Upgrading Tanzania's artisanal and small-scale mining through investor partnerships: Opportunities and challenges por Schoneveld, George C., Chacha, M., Njau, M., Weng, X., Jonsson, J.

Materias: “…artisanal method…”
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