DSHW-1998-004216 - 0901a06880157adc

Rug SEP 01_'9e. .0BJ21fiM THIO^ E^SigEining 8^.756-5454 P. 1/2 p, 1
To; Bill Moellef Clittor Mining ^-<^P From. Bob Holladay 767-2883 ^^Iiy98 16:22.00 Paget of 2
ATVW: Je^^ MNit^FL
Clifton Mining Company
V Canyon Crest Su
Alpine, Utah 84004
[phone] ^£° 1^998
Clifton Mining Company Or-.<^s—
70 W Canyon Crest Suite D HtCFiyPn
AlDine. Utah 84004 ^"-SVCU
Fax [phone]
11 August 1998
D'^'sion Of Solid SHazardSaste
"fah Department Of Enwronmenaro ity
Thiokol Corporation
Ann: Franl: Walker
ayFajc: 435-863-4037
Dear r>nnk:
it hai come lo our attenliun Ihat Thiokol has a qiuntiiy of silver contamioated soil that has
been galticred and stabilized widi liiiK and <:• ready lo be landllllod, W« would like to
propose virbat may be an enwirountentaliy preferable aliernarive, Clifton Miniitg lias recently
completed and placed in operattoa a smai] batch cyanide leaching pia&t liut we believe would
be sdlitble for r«iiK»ing tfae silver from ihis soil, .\ brief description of xhe plant is
appended.
Wc Kvould propose surooDtng the marerial at its present locatinn to remove the rdaaveFy
unconumiilaTed rocks larger than 3/8', hauling the tJae portion in our trucks to the plant ai
Gold Hill, Uuh. and processing it The line dirt, with silver removed, could then be dispoiied
of with our oxber Tailings, or ratunied to 'J'hiokol for disposal.
We ivould need Thiokol to fumish & piece of equipment with operator to load the maurial
onto the screen and/or trucks aa needed, Thiokol would also need to dispose of (he rocks left
behind and pay any costs associated with returning the fine material to Thiokol, should thai
be desir«d. Clifton Mining wouid retiin the coniaiQed silver as payment,
W< would «xp«ci diat Ihiokol lepresdnutives would vijiit the CUfb>ti plant to crveluate its
suitability, and diat CliAon representatives would visit the Thiokol site to iajtc- samples for
analysis before any agreeineni is fmallzed.
If you have any queshons or need further clarificaition, contact me at (435) 753-i 157 or (801)
37(»-4«77 or Bill Moeller or Keiifa MooHer aithe numbers on the ietlefhead. 'fhanks.
Sincerely,
Koben J. HoUad8>'. Vise Presid^ (Operatiofl.<;)
,u,u.M.™,.SEP 01 'ge 0e:21Rn THIOk^i E-siqr ' •-• —
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CliftoD Mining Company
Gold Hill Leach Plant
Clifton >rlinm& Co. hiet constructed a small plant at its Cactus Mill Site near Cold Ilill, Utah,
It is a batch lea«fa plant capable of proeessirg aboui five to fifteen tons per day using sodium
cyonido or une of SCV«TB} altemate lixiviants to extract gold and silver From ores or
concemraTss
The plant occupies abmit 1800 iiquare feet of a currently unused 5000 square foot building.
'The equipniesi area is surrounded by a cunaeie retaining wall io provide secondary
containment of all liquids used.
Tf>e plant consists of two leach vessels, one 2400 ga/lons, the other 3600 gallons, a: slurry
pump, diickener, aod 4' x 9' tioiizcnita! belt filter Soiurion from tfae Qlter goes to a 6000
gallon pras taok, through a, Merrill-Crowe unit >*'ith a 3' x 3' plate & frame filter to a 5000
^ion barren tank.
Power is supplied by either of two diesel powered generators installed for other plants on site
Dry ground ore or concentrate is introduced to i& leach vessels by from end loader. The
leached ore is double rinsed with clean water, treated with calcium hypochlorite to destroy
DO}' roaidDn) oyanida, and enrini th* plant nrea nr filter raV.ii Tivn riimtrii ara tirailahli* nn
site for melfing of dore.
Process waler is tcc^'clvd. Ssit bu'Jd up is <l«alt with by bleeding off small amounts of barren
sottJtion as needed fbr evaporation and solids disposal.
Chemicals used are sodium hydroxide, sodiuin cyanide, powdered zinc and small amounts of
a filter aid.
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