The Gilded Lens
Sr. Member
- Oct 13, 2014
- 476
- 815
- Detector(s) used
- Garrett 14" Pan, Garrett 15" Super Sluice Pan, Bazooka 36" Sniper,
Hand Dredge
- Primary Interest:
- Prospecting
Found this beautifully desinged pdf about mercury collections in Nevada County in the late 90's. Found it interesting.
This little snippet:
In 2007 suction dredgers again stated they needed
help getting rid of mercury they collect during
Department of Fish and Game and State Water
Board Public meeting on suction dredging.
„
In response, the State Water Resources Control
Board posts information about mercury on its web
site.
http://www.swrcb.ca.gov/water_issues/programs/cwa401/docs/suctiondredge/mercury_recycle.pdf
and this one too:
http://www.swrcb.ca.gov/water_issues/programs/cwa401/docs/suctiondredge/2007merc_drdg_rpt.pdf
Why on earth (other than nefarious reasons) would they say,
"It is unacceptable to encourage suction dredgers to “clean up” in stream mercury hotspots
because dredges release too much mercury in easily transportable forms. There may be
other reasons to discourage suction dredging of mercury hotspots once the bioavailablity
of fl oured mercury becomes known. It would be advisable for land management agencies
to contact dredgers through their clubs and discourage them from trying to dredge liquid
mercury from in-river hotspots on public lands. Removing mercury with hand-operated
suction tubes, or better yet, reporting hotspot locations to land management agencies is
a better strategy."
Isn't the land management agency going to use a suction dredge as well? Don't mean to stir the pot up any more than it is, but thought these older articles were interesting and I really enjoy learning about this topic.
This little snippet:
In 2007 suction dredgers again stated they needed
help getting rid of mercury they collect during
Department of Fish and Game and State Water
Board Public meeting on suction dredging.
„
In response, the State Water Resources Control
Board posts information about mercury on its web
site.
http://www.swrcb.ca.gov/water_issues/programs/cwa401/docs/suctiondredge/mercury_recycle.pdf
and this one too:
http://www.swrcb.ca.gov/water_issues/programs/cwa401/docs/suctiondredge/2007merc_drdg_rpt.pdf
Why on earth (other than nefarious reasons) would they say,
"It is unacceptable to encourage suction dredgers to “clean up” in stream mercury hotspots
because dredges release too much mercury in easily transportable forms. There may be
other reasons to discourage suction dredging of mercury hotspots once the bioavailablity
of fl oured mercury becomes known. It would be advisable for land management agencies
to contact dredgers through their clubs and discourage them from trying to dredge liquid
mercury from in-river hotspots on public lands. Removing mercury with hand-operated
suction tubes, or better yet, reporting hotspot locations to land management agencies is
a better strategy."
Isn't the land management agency going to use a suction dredge as well? Don't mean to stir the pot up any more than it is, but thought these older articles were interesting and I really enjoy learning about this topic.
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