http://intranet2.minem.gob.pe/web/mineria/DIRECTORIO/DIRECTORIO/PLANTASBENEFICIONEW/DetalleResolucion.asp?NOMBRE_PLANTA=CASAPALCA&ID_UNIDAD=P0103991&NOMBRE_TITULAR=EMPRESA%20MINERA%20LOS%20QUENUALES%20S.A.#01
More contracts, contractors and photos are included in the PDF.