Arsenopyrite

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The top of matrix is covered with metallic crystals of arsenopyrite measuring to 0.4 cm in size. In good condition. The Noche Buena Mine is a large open-pit gold and silver mining operation located in the state of Sonora, Mexico, within the prolific Herradura mining district (frequently grouped in regional Mexican mining discussions alongside northern states like Zacatecas). Geologically, the deposit sits within a major regional trend characterized by extensive volcanic and sedimentary sequences hosting disseminated gold mineralization, which is typically extracted using conventional heap-leach and open-pit methods. Historically, modern large-scale development and commercial production at Noche Buena began in the early 21st century under major mining companies, contributing significantly to modern Mexican precious metal output through active operational phases and ongoing resource re-evaluations.