{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Design of drill-hole grid spacings for evaluating low-grade copper deposits","author_name":"Richard F. Hewlett","thumbnail_url":"https://www.ebooknetworking.net/books/B00/2WG/bigB002WGJIG2.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B002WGJIG2.html\">Design of drill-hole grid spacings for evaluating low-grade copper deposits</a>","width":400,"height":300}