English to Spanish Other Mining & Minerals / Gems Contrato de Explotación Minera

all sales, production, extraction, net proceeds, use, gross receipts, severance, ad valorem, value added tax, excise, export, import and other taxes, custom duties, governmental royalties and other governmental charges, if any, payable by the Producer or its Affiliates with respect to the existence, **** severance***, production, removal, sale, import, export, transportation, or disposition of ore, concentrates, doré, Refined Gold, Refined Silver, or other Mineral Products produced from the Royalty Properties or in respect of the Royalty...

¿De que tipo de impuesto se trata? Al parecer no tiene nada que ver con cuestiones laborales, pues no hay referencia a ello. Gracias.