{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Placer mining in Alaska: Methods and costs at operations using hydraulic and mechanical excavation equipment with nonfloating washing plants","author_name":"Bruce I. Thomas","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3HK/bigB003HKRQ2U.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003HKRQ2U.html\">Placer mining in Alaska: Methods and costs at operations using hydraulic and mechanical excavation equipment with nonfloating washing plants</a>","width":400,"height":300}