Post by Deleted on Feb 28, 2014 8:06:29 GMT -5
1994, The Alaska District of the U.S. Army Corps of Engineers issued Special Public Notice 94-10, which concluded that, the effects from small suction dredges and hand operations were de minimus and did not require Army Corp permitting;
2004,The Alaska District of the Army Corps issued Special Public Notice 2004-06, which restated that these placer mining activities still have “de minimus impacts” on the aquatic environment:
1994,In an Environmental Impact Report, the California Department of Fish and Game, reached the conclusion that suction dredge mining had a less than significant impact on the environment;
2012,The California Department of Fish and Wildlife, under a court order, completed another Environmental Impact Report on small-scale gold suction dredging, at a cost to the state of $1.2 to $1.5 million dollars. The overall conclusion was that the environmental impact from operation of these small scale dredges was less-than-significant for 56 of the 60 factors reviewed;
2001, The Siskiyou National Forest, Oregon Draft Environmental Impact Report, Suction Dredging Activities are less-than-significant;
2004, The Clearwater National Forest, Idaho completed the draft Environ-mental Impact Statement for Small-Scale Suction Dredging in Lolo Creek and Moose Creek Clearwater and Idaho Counties. The report stated that “EPA generally supports the terms and conditions for dredging and we believe they are designed to protect fish habitat and seem to minimize the potential to damage stream channels and banks.”, which supports a less-than-significant outcome;
2012, Wallowa-Whitman National Forest, Oregon FINAL Supplemental Environmental Impact Statement reached the conclusion that suction dredge mining had a less than significant impact on the environment; and,
2013, U.S. Environmental Protection Agency Biological Evaluation Small Suction Dredge Placer Mining in Idaho reached the conclusion that suction dredge mining would have a less than significant impact on the environment.
There have also been a number of other more recent reports with the same conclusion, starting with:
Results from the 1992 Chugach National Forest, Alaska Report of Water Quality Cumulative Effects of Placer Mining which stated that, “The results from water quality sampling do not indicate any strong cumulative effects from multiple placer mining operations within the sampled drainage” (Huber and Blanchet).( NOTE: The operations studied here were large on-stream and off-stream commercial operations.)
In 1999 the U.S. Environmental Protection Agency reported the results of a cumulative field study evaluating the performance of 10, 8, and 4 inch gold dredges and concluded environmental impacts from these operations were less than significant (Royer et al., 1999).
Bayley (OSU), 2003, (for Siskiyou N.F., Oregon) Response of fish to cumulative effects of suction dredge and hydraulic mining in the Illinois subbasin concluded,”The statistical analyses did not indicate that suction dredge mining has no effect on the three responses measured, but rather any effect that may exist could not be detected at the commonly used Type I error rate of 0.05.”
All of these reports agree that the effect of small-scale gold suction dredging on the environment is less-than-significant, minimal, or immeasurable.
Net Environmental Benefits of Small-scale Suction Dredging: These important studies of small-scale suction dredge operations show impacts on the environment have a less-than-significant footprint. Furthermore, they make note of beneficial factors that create an overall net benefit to some areas. These factors need to be taken into consideration when interpreting suction dredge activities and further incorporated into best management practices agreements.
Experts agree that fish survival improves under moderate turbid conditions (25 NTU):
Results of the Gregory 1993 report notes that any reduction in feeding efficiency of fish may be offset by reduced risk of predation at moderate levels of suspended sediment.
CH2M HILL in 2000, added to that result showing that elevated total suspended solids (TSS) conditions, similar to turbidity plumes created from dredging activity, have been reported to enhance cover conditions, reduce piscivorous fish/bird predation rates, and improve survival.
Stern 1988, stated that, “Pools created by abandoned dredger sites can provide holding and resting areas for juvenile and adult salmonids”.
Harvey 1991, studied fish size and habitat depth relationships in headwater streams. During times of low flow in a river or stream, increased water depth can provide a refuge from predation by birds and mammals.
Nielsen 1994, examined excavations from dredging operations finding they can result in temporarily formed pools or deepen existing pools, which may improve fish habitat. Deep scour may intersect subsurface flow creating pockets of cool water during summer, which can provide important habitat for fish
2001, Siskiyou National Forest, found if excavated pools reduce pool temperatures, they could provide important coldwater habitats for salmonids living in streams with elevated temperatures.
In1999, the U.S. Environmental Protection Agency reported the results of a cumulative field study evaluating the performance of 10, 8, and 4-inch gold dredges. The findings showed an increase in macroinvertibrate density and improved diversity in mined areas.
In 2010, The American River Spawning Gravel Supplemental Environmental Assessment (EA) points to the benefits of additions of spawning gravels even coming from an outside source. The addition of spawning gravels are to increase and improve Chinook salmon and steelhead spawning and rearing habitat.
Again in the 2011, American River Spawning Gravel EA; the supplemental Environmental Assessment Report supported the previous EA reporting benefits of supplementing spawning gravels
Tailings from small-scale suction dredge mining provide excellent spawning gravel. Suction dredging breaks up compacted steam beds; the gravels are dispersed by the high stream flows, making up suitable spawning gravels each year. If insufficient substrate is available Salmonids are left with the choice of spawning over and destroying previously built redds, or using cleaned dredge tailings.
Additional benefits of small-scale suction dredge mining include:Measureable improvement in water quality due to removal of wastes left by other users of the waters or that have eroded into the waterways. 100’s of pounds of lead fishing weights, bullets, water bottles, sunglasses, car debris, nails, broken glass, etc. are removed from our waterways and camping and recreational sites by miners every year.
Laws should be based on facts not on opinion and conjecture.
Here is a list of studies and reports that have been compiled over years of research that can be referenced available to all:
CDFG, 1997. draft Environmental Impact Report: Adoption of Amended Regulations for Suction Dredge Mining. State of California, The Resource Agency, Department of Fish and Game
Cooley, M.F. 1995. Forest Service yardage Estimate. U.S. Department of Agriculture, U.S. Forest Service, Siskiyou National Forest, Grants Pass, Oregon.
Griffith, J.S. and D.A. Andrews. 1981. Effects of a small suction dredge on fishes and aquatic invertebrates in Idaho streams. North American Journal of Fisheries Management 1:21- 28.
Harvey, B.C., K. McCleneghan, J.D. Linn, and C.L. Langley, 1982. Some physical and biological effects of suction dredge mining. Lab Report No. 82-3. California Department of Fish and Game. Sacramento, CA.
Harvey, B.C. 1986. Effects of suction gold dredging on fish and invertebrates in two California streams. North American Journal of Fisheries Management 6:401-409.
Hassler, T.J., W.L. Somer and G.R. Stern. 1986. Impacts of suction dredge mining on anadromous fish, invertebrates and habitat in Canyon Creek, California. California Cooperative Research Unit, U.S. Fish and Wildlife Service, Humbolt State University. Cooperative Agreement No 14-16-0009-1547.
Huber and Blanchet, 1992. Water quality cumulative effects of placer mining on the Chugach National Forest, Kenai Peninsula, 1988-1990. Chugach National Forest, U.S. Forest Service, Alaska Region, U.S. Department of Agriculture.
Lewis, 1962. Results of Gold Suction Dredge Investigation. Memorandum of September 17, 1962. California Department of Fish and Game, Sacramento, CA.
North, P.A., 1993. A review of the regulations and literature regarding the environmental impacts of suction gold dredging. U.S. Environmental Protection Agency, Region 10, Alaska Operations Office. EP 1.2: G 55/993.
Prussian, A.M., T.V. Royer and G.W. Minshall, 1999. Impact of suction dredging on water quality, benthic habitat, and biota in the Fortymile River, Resurrection Creek, and Chatanika River, Alaska, FINAL REPORT. US Environmental Protection Agency, Region 10, Seattle, Washington.
SNF, 2001. Siskiyou National Forest, Draft Environmental Impact Statement: Suction Dredging Activities. U.S. Department of Agriculture, U.S. Forest Service, Siskiyou National Forest, Medford, OR.
Somer, W.L. and T.J. Hassler. 1992. Effects of suction-dredge gold mining on benthic invertebrates in a northern California stream. North American Journal of Fisheries Management 12:244-252
Stern, 1988. Effects of suction dredge mining on anadromous salmonid habitat in Canyon Creek, Trinity County, California. M.S. Thesis, Humbolt State University, Arcata, CA.
Thomas, V.G. 1985. Experimentally determined impacts of a small, suction gold dredge on a Montana stream. North American Journal of Fisheries Management 5:480-488.
US EPA, 2001. Mercury Recovery from Recreational Gold Miners.
Wanty, R.B., B. Wang, and J. Vohden. 1997. Studies of suction dredge gold-placer mining operations along the Fortymile River, eastern Alaska. U.S. Geological Survey Fact Sheet FS-154-9
If ya want to read more visit:
prospectorjack.wordpress.com/category/gold-prospecting/
2004,The Alaska District of the Army Corps issued Special Public Notice 2004-06, which restated that these placer mining activities still have “de minimus impacts” on the aquatic environment:
1994,In an Environmental Impact Report, the California Department of Fish and Game, reached the conclusion that suction dredge mining had a less than significant impact on the environment;
2012,The California Department of Fish and Wildlife, under a court order, completed another Environmental Impact Report on small-scale gold suction dredging, at a cost to the state of $1.2 to $1.5 million dollars. The overall conclusion was that the environmental impact from operation of these small scale dredges was less-than-significant for 56 of the 60 factors reviewed;
2001, The Siskiyou National Forest, Oregon Draft Environmental Impact Report, Suction Dredging Activities are less-than-significant;
2004, The Clearwater National Forest, Idaho completed the draft Environ-mental Impact Statement for Small-Scale Suction Dredging in Lolo Creek and Moose Creek Clearwater and Idaho Counties. The report stated that “EPA generally supports the terms and conditions for dredging and we believe they are designed to protect fish habitat and seem to minimize the potential to damage stream channels and banks.”, which supports a less-than-significant outcome;
2012, Wallowa-Whitman National Forest, Oregon FINAL Supplemental Environmental Impact Statement reached the conclusion that suction dredge mining had a less than significant impact on the environment; and,
2013, U.S. Environmental Protection Agency Biological Evaluation Small Suction Dredge Placer Mining in Idaho reached the conclusion that suction dredge mining would have a less than significant impact on the environment.
There have also been a number of other more recent reports with the same conclusion, starting with:
Results from the 1992 Chugach National Forest, Alaska Report of Water Quality Cumulative Effects of Placer Mining which stated that, “The results from water quality sampling do not indicate any strong cumulative effects from multiple placer mining operations within the sampled drainage” (Huber and Blanchet).( NOTE: The operations studied here were large on-stream and off-stream commercial operations.)
In 1999 the U.S. Environmental Protection Agency reported the results of a cumulative field study evaluating the performance of 10, 8, and 4 inch gold dredges and concluded environmental impacts from these operations were less than significant (Royer et al., 1999).
Bayley (OSU), 2003, (for Siskiyou N.F., Oregon) Response of fish to cumulative effects of suction dredge and hydraulic mining in the Illinois subbasin concluded,”The statistical analyses did not indicate that suction dredge mining has no effect on the three responses measured, but rather any effect that may exist could not be detected at the commonly used Type I error rate of 0.05.”
All of these reports agree that the effect of small-scale gold suction dredging on the environment is less-than-significant, minimal, or immeasurable.
Net Environmental Benefits of Small-scale Suction Dredging: These important studies of small-scale suction dredge operations show impacts on the environment have a less-than-significant footprint. Furthermore, they make note of beneficial factors that create an overall net benefit to some areas. These factors need to be taken into consideration when interpreting suction dredge activities and further incorporated into best management practices agreements.
Experts agree that fish survival improves under moderate turbid conditions (25 NTU):
Results of the Gregory 1993 report notes that any reduction in feeding efficiency of fish may be offset by reduced risk of predation at moderate levels of suspended sediment.
CH2M HILL in 2000, added to that result showing that elevated total suspended solids (TSS) conditions, similar to turbidity plumes created from dredging activity, have been reported to enhance cover conditions, reduce piscivorous fish/bird predation rates, and improve survival.
Stern 1988, stated that, “Pools created by abandoned dredger sites can provide holding and resting areas for juvenile and adult salmonids”.
Harvey 1991, studied fish size and habitat depth relationships in headwater streams. During times of low flow in a river or stream, increased water depth can provide a refuge from predation by birds and mammals.
Nielsen 1994, examined excavations from dredging operations finding they can result in temporarily formed pools or deepen existing pools, which may improve fish habitat. Deep scour may intersect subsurface flow creating pockets of cool water during summer, which can provide important habitat for fish
2001, Siskiyou National Forest, found if excavated pools reduce pool temperatures, they could provide important coldwater habitats for salmonids living in streams with elevated temperatures.
In1999, the U.S. Environmental Protection Agency reported the results of a cumulative field study evaluating the performance of 10, 8, and 4-inch gold dredges. The findings showed an increase in macroinvertibrate density and improved diversity in mined areas.
In 2010, The American River Spawning Gravel Supplemental Environmental Assessment (EA) points to the benefits of additions of spawning gravels even coming from an outside source. The addition of spawning gravels are to increase and improve Chinook salmon and steelhead spawning and rearing habitat.
Again in the 2011, American River Spawning Gravel EA; the supplemental Environmental Assessment Report supported the previous EA reporting benefits of supplementing spawning gravels
Tailings from small-scale suction dredge mining provide excellent spawning gravel. Suction dredging breaks up compacted steam beds; the gravels are dispersed by the high stream flows, making up suitable spawning gravels each year. If insufficient substrate is available Salmonids are left with the choice of spawning over and destroying previously built redds, or using cleaned dredge tailings.
Additional benefits of small-scale suction dredge mining include:Measureable improvement in water quality due to removal of wastes left by other users of the waters or that have eroded into the waterways. 100’s of pounds of lead fishing weights, bullets, water bottles, sunglasses, car debris, nails, broken glass, etc. are removed from our waterways and camping and recreational sites by miners every year.
Laws should be based on facts not on opinion and conjecture.
Here is a list of studies and reports that have been compiled over years of research that can be referenced available to all:
CDFG, 1997. draft Environmental Impact Report: Adoption of Amended Regulations for Suction Dredge Mining. State of California, The Resource Agency, Department of Fish and Game
Cooley, M.F. 1995. Forest Service yardage Estimate. U.S. Department of Agriculture, U.S. Forest Service, Siskiyou National Forest, Grants Pass, Oregon.
Griffith, J.S. and D.A. Andrews. 1981. Effects of a small suction dredge on fishes and aquatic invertebrates in Idaho streams. North American Journal of Fisheries Management 1:21- 28.
Harvey, B.C., K. McCleneghan, J.D. Linn, and C.L. Langley, 1982. Some physical and biological effects of suction dredge mining. Lab Report No. 82-3. California Department of Fish and Game. Sacramento, CA.
Harvey, B.C. 1986. Effects of suction gold dredging on fish and invertebrates in two California streams. North American Journal of Fisheries Management 6:401-409.
Hassler, T.J., W.L. Somer and G.R. Stern. 1986. Impacts of suction dredge mining on anadromous fish, invertebrates and habitat in Canyon Creek, California. California Cooperative Research Unit, U.S. Fish and Wildlife Service, Humbolt State University. Cooperative Agreement No 14-16-0009-1547.
Huber and Blanchet, 1992. Water quality cumulative effects of placer mining on the Chugach National Forest, Kenai Peninsula, 1988-1990. Chugach National Forest, U.S. Forest Service, Alaska Region, U.S. Department of Agriculture.
Lewis, 1962. Results of Gold Suction Dredge Investigation. Memorandum of September 17, 1962. California Department of Fish and Game, Sacramento, CA.
North, P.A., 1993. A review of the regulations and literature regarding the environmental impacts of suction gold dredging. U.S. Environmental Protection Agency, Region 10, Alaska Operations Office. EP 1.2: G 55/993.
Prussian, A.M., T.V. Royer and G.W. Minshall, 1999. Impact of suction dredging on water quality, benthic habitat, and biota in the Fortymile River, Resurrection Creek, and Chatanika River, Alaska, FINAL REPORT. US Environmental Protection Agency, Region 10, Seattle, Washington.
SNF, 2001. Siskiyou National Forest, Draft Environmental Impact Statement: Suction Dredging Activities. U.S. Department of Agriculture, U.S. Forest Service, Siskiyou National Forest, Medford, OR.
Somer, W.L. and T.J. Hassler. 1992. Effects of suction-dredge gold mining on benthic invertebrates in a northern California stream. North American Journal of Fisheries Management 12:244-252
Stern, 1988. Effects of suction dredge mining on anadromous salmonid habitat in Canyon Creek, Trinity County, California. M.S. Thesis, Humbolt State University, Arcata, CA.
Thomas, V.G. 1985. Experimentally determined impacts of a small, suction gold dredge on a Montana stream. North American Journal of Fisheries Management 5:480-488.
US EPA, 2001. Mercury Recovery from Recreational Gold Miners.
Wanty, R.B., B. Wang, and J. Vohden. 1997. Studies of suction dredge gold-placer mining operations along the Fortymile River, eastern Alaska. U.S. Geological Survey Fact Sheet FS-154-9
If ya want to read more visit:
prospectorjack.wordpress.com/category/gold-prospecting/
