Placer gold deposits played an important role in early human history and in the pioneering stages of settlement of new regions because they could readily be mined on a small to moderate scale using simple handmade equipment. Thus, they provided quick assets for the early settlers and thereby ...
This machine is the last Colorado representative of an industry, an era and a form of technology. Mining dredges were huge and noisy, yet they were welcomed as a form of economic relief to the old industry of placer mining. Streambed mineral deposits, especially gold, have attracted mankind ...
We look to the prospectors of the past and admire their ability to locate gold deposits with nothing more than their own ingenuity and a sense of adventure. Some techniques are no longer used and some haven’t changed for centuries. Dowsing fits somewhere in between. It’s always been a m...
Hydro-needle method for softening frozen rocks in the development of placer deposits Precambrian quartz-pebble conglomerates of the Needle Mountains of southwest Colorado are present in the Vallecito Conglomerate and the basal conglomerate ... AA Kuhtin,V Rochev 被引量: 0发表: 2020年 The Many Sid...
SUMMARY1. ‘Placer’ mining for alluvial deposits of gold in a number of stream systems in interior Alaska represents a major disturbance to the stream bed... DJ Gilvear,TM Waters,AM Milner - 《Freshwater Biology》 被引量: 103发表: 1995年 ...
1. 'Placer' mining for alluvial deposits of gold in a number of stream systems in interior Alaska represents a major disturbance to the stream bed and affe... DJ Gilvear,TM Waters,AM Milner - 《Freshwater Biology》 被引量: 44发表: 2010年 EFFECTS OF PLACER MINING DISCHARGE ON HEALTH AND...
SUMMARY1. ‘Placer’ mining for alluvial deposits of gold in a number of stream systems in interior Alaska represents a major disturbance to the stream bed... DJ Gilvear,TM Waters,AM Milner - 《Freshwater Biology》 被引量: 103发表: 1995年 Comparative toxicity of inorganic contaminants released...
1. 'Placer' mining for alluvial deposits of gold in a number of stream systems in interior Alaska represents a major disturbance to the stream bed and affe... DJ Gilvear,TM Waters,AM Milner - 《Freshwater Biology》 被引量: 44发表: 2010年 EFFECTS OF PLACER MINING DISCHARGE ON HEALTH AND...