| Abstract: | An experimental mining project was conducted in northeast St. Johns County, Florida, to determine the feasibility of extracting deeply buried phosphate ore by hydraulic borehole mining techniques. The phosphate zone is between 232 and 250 feet below land surface and consists of approximately equal proportions of fine-grained phosphate, sand, and clay. Six wells were constructed at the test site to monitor effects of the mining operation on the ground-water resources of the area. One well penetrated the Floridan aquifer beneath the phosphate zone, another was completed in the phosphate zone, and the other four were finished in water-bearing zones above the phosphate zone. The mining project consisted of three separate tests in which different mining methods were used. Changes in water levels, other than in the mined zone, were detected only in the overlying monitored zone during the first two tests as a result of roof failures in cavities formed by the mining operation. Water-quality changes were observed only in the mined zone and resulted from the injection of water from the deeper Floridan aquifer as part of the mining operation. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 27498 |
| Citation Author: | Hampson, P. S. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iv, 29 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 83-4149 |
| Citation Search Results Text: | Effects of hydraulic borehole mining on ground water at a test site in northeast St Johns County, Florida; 1984; WRI; 83-4149; Hampson, P. S. |
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| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Effects of hydraulic borehole mining on ground water at a test site in northeast St Johns County, Florida; 1984; WRI; 83-4149; Hampson, P. S. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1983/4149/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1983/4149/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
