5 posts in this topic
Well got the dredge fixed up as much as I'm gonna! Springs here and I got the fever. So in we go.
Took the dredge in assembled just skidded it in on the float and pulled it with a snowmobile. That was nice with all the snow it was about a mile in.
Getting the dredge into the canyon was another deal. Although not to bad lowered it in with a rope and a pulley.
Made for a long day but I was glade we got it in before the snow melted, skidding everything was a lot easier than packing in.
Went up the following weekend to try out the new six inch dredge!
Had big plans to get in early Saturday and work late, figured I could get 8-10 hours on the nozzle. LOL! Well its been a long winter and seems I'm a bit outta shape. After four hours of dredging in the cold I was done!
All in all I had a blast. The new dredge really put out compared to the four inch I've been using. Even got a few grams for the effort.
May not seem like much but after being cooped up all winter and seeing all the gold post from down south and across the pond........ I was getting Bitchy ;-)
P.S. Hope the snow pics helps you down in Texas.
By Steve Herschbach
From Placer Gold Deposits of Nevada, USGS Bulletin 1356, By Maureen G. Johnson 1973
The first authenticated discovery of placer gold in Nevada was made in 1849 by Abner Blackburn, a member of an emigrant train to California, at the junction of Gold Canyon and the Carson River at the present site of Dayton, Lyon County (De Quille, 1891; Vanderburg, 1936a). Parties of men worked the gravels in Gold Canyon and nearby Six Mile Canyon, Storey County, for 8 years before the source of the placers, the Ophir silver lode, was discovered by Peter O'Reiley and Patrick McLaughlin in 1857 while digging a small water hole for placer mining in Six Mile Canyon (De Quille, 1891). Other lode discoveries in the immediate area followed, and soon the whole world knew of the Comstock lode in Nevada. Although placer mining continued on a small scale in Gold Canyon and Six Mile Canyon, and other placers were discovered elsewhere in the State, the richness and fame of the Comstock lode far overshadowed the importance of placer production and new placer discoveries.
Following the discovery of placers at Gold Canyon, placer discoveries in Nevada were broadly in three periods: the 1860's to 1880's, when many small deposits throughout the State were discovered and sporadically worked and several large placers were discovered and extensively worked; the short period between 1906 and 1910, when very rich placers were discovered at Lynn, Battle Mountain, Manhattan, and Round Mountain; the early 1930's, when economic conditions created by the depression caused a renewed interest in placer mining, and many individuals sought, and a few discovered, new placer areas throughout the State. The location of the placers described in this report is shown on plate 1.
Very little factual information can be found about the early periods of placer mining in Nevada. For many placers, the only reports available are hearsay estimates of production and speculations about the extent of the placer ground based on remnants of placer pits, shafts, and other workings. Many of the placers said to have had a high production between 1860 and 1890 were worked by Chinese miners who came to Nevada during the building of the railroads and stayed on to work at mining and other activities. The Chinese were reputed to be secretive with their earnings from the placers and did not ship the gold to the mint by Wells Fargo or other shippers. They worked the gravels very thoroughly in areas where American miners did not wish to expend great labor to win the gold. The placers in the Sierra and Spring Valley districts, Pershing County, were worked by Chinese miners; they have a very high estimated production before 1900 and a comparatively low known production since that time.
One reason for the lack of information about early placer-mining activity in Nevada was the great attention given to the rich silver-lode districts such as the Comstock, Eureka, and Reese River districts. Whereas in many other States, the discovery of gold placers stimulated the search for lode-gold deposits and other gold placers, in Nevada early attention was devoted to searching for rich silver lodes not necessarily associated with derived placers.
The comparatively late discovery of some of the richest placers in the State has afforded a very clear picture of the development of placer mining during the 1900's. The discovery of rich silver ores at Tonopah in 1900 and rich gold ores at Goldfield in 1902 stimulated great activity in mining exploration throughout Nevada. Many placers discovered during the 1906–10 period were found by men looking for ores similar to ores at Tonopah and Goldfield. Placer mining at Manhattan and Round Mountain districts, Nye County, and Battle Mountain district, Lander County, began with numerous small drywash operations in the gravels, then expanded as water supplies were developed for sluicing and hydraulic methods of mining. Late in the history of these districts, but long after many other placer districts were inactive, large-scale dredging operations began. The success of the dredge operations in these semiarid districts is unique in the history of placer mining in the Southwestern States.
Placer mining history in the other districts is typical of desert placer mining throughout the southwest. Most production resulted from the relatively intense period of prospecting immediately following discovery; a decline in placer-mining activity followed, then a small revival during the early 1930's. The economic depression of the early 1930's stimulated investigations of many Nevada placer districts for the purpose of developing large-scale placer-mining operations. By the late 1930's, many mining companies had investigated many placer areas and had formulated plans to develop certain areas. The placer activity of the 1930's was abruptly halted by the beginning of World War II and the passage of War Board Order L–208, which restricted gold mining throughout the country. The dredge operation at Manhattan was given special permission to continue operations, although on a reduced scale, and, as a result, placer gold production after 1942 did not decline as markedly in Nevada as in other States.
Most of the placer mining was done by the basic methods of drywashing, sluicing, and rarely, small-scale hydraulic mining. In addition to the large dredge operations at Manhattan, Round Mountain, and Battle Mountain, other dredges operated in different districts, notably Silver City, Lyon County; Spring Valley, Pershing County; Van Duzer, Elko County; and Bullion, Lander County. Since the completion of the Round Mountain dredge operation in 1959, placer mining in Nevada has progressively diminished in importance.
By Steve Herschbach
Alaska consists of more than 663,000 square miles (1,717,000 square kilometers) of land—more than a sixth of the total area of the United States—and large tracts of it have not been systematically studied or sampled for mineral-resource potential. Many regions of the State are known to have significant mineral-resource potential, and there are currently six operating mines in the State along with numerous active mineral exploration projects. The U.S. Geological Survey and the Alaska Division of Geological & Geophysical Surveys have developed a new geospatial tool that integrates and analyzes publicly available databases of geologic information and estimates the mineral-resource potential for critical minerals, which was recently used to evaluate Alaska. The results of the analyses highlight areas that have known mineral deposits and also reveal areas that were not previously considered to be prospective for these deposit types. These results will inform land management decisions by Federal, State, and private landholders, and will also help guide future exploration activities and scientific investigations in Alaska.
Karl, S.M., and Labay, K.A., Geospatial analysis identifies critical mineral-resource potential in Alaska: U.S. Geological Survey Fact Sheet 2017–3012, 4 p., https://doi.org/10.3133/fs20173012.
Fact Sheet https://pubs.usgs.gov/fs/2017/3012/fs20173012.pdf
Full Report https://pubs.er.usgs.gov/publication/ofr20161191
By Steve Herschbach
Originally a silent film by the U.S. Smelting and Mining Co. from 1949, station KUAC of Fairbanks, Alaska added a sound track and narration to explain the process and history of mining gold in Alaska's rugged conditions.
I found a TOP NOTCH Prospecting video that answers most of my desert prospecting questions in terms I can understand vs geologist mumbo jumbo. Unfortunately, Rob Allisons website says the video has been discontinued and he has only 2 copies left at 15 bucks each. It is made by Chris Ghoulson from Arizona and the title is " Nugget Hunting Essentials,Volume 2, From the Ground Up " and is 90 minutes long with intro by Jonathan Porter. Answers about 75% of my recent questions on this thread and then some. Too bad it is discontinued?? !! I wonder what Volume 1 was all about? The video covers such things as detecting recent dry washer tailing piles-what to look for and what to ignore, red dirt and white quartz rocks, ironstone or magnetite rocks,detector coils and what makes them work, what hotrocks, trash, and gold sound like on a Minelab GPX machine, rock formations to look for to improve your nugget finding chances, and plenty of video examples of these things so no guessing...when to use large vs small coils, dangerous critters in the desert, etc, etc