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CONTACT INFORMATION Mining Records Curator Arizona Geological Survey 416 W. Congress St., Suite 100 Tucson, Arizona 85701 520-770-3500 http://www.azgs.az.gov [email protected] The following file is part of the James Doyle Sell Mining Collection ACCESS STATEMENT These digitized collections are accessible for purposes of education and research. We have indicated what we know about copyright and rights of privacy, publicity, or trademark. Due to the nature of archival collections, we are not always able to identify this information. We are eager to hear from any rights owners, so that we may obtain accurate information. Upon request, we will remove material from public view while we address a rights issue. CONSTRAINTS STATEMENT The Arizona Geological Survey does not claim to control all rights for all materials in its collection. These rights include, but are not limited to: copyright, privacy rights, and cultural protection rights. The User hereby assumes all responsibility for obtaining any rights to use the material in excess of “fair use.” The Survey makes no intellectual property claims to the products created by individual authors in the manuscript collections, except when the author deeded those rights to the Survey or when those authors were employed by the State of Arizona and created intellectual products as a function of their official duties. The Survey does maintain property rights to the physical and digital representations of the works. QUALITY STATEMENT The Arizona Geological Survey is not responsible for the accuracy of the records, information, or opinions that may be contained in the files. The Survey collects, catalogs, and archives data on mineral properties regardless of its views of the veracity or accuracy of those data. I Kappes, Gassiday & Associates 2845 Glen dale Avenue , Spanks, .\'elsda 8543 02-356-710 - Telex 1'0049 - Fax ; 02 S56 5609 18 June 1987 Dear Sir : This letter comprises a bid for one 200 US gpm carbon Adsorption-Desorption-Recovery plant (ADR plant) for a project located in Nevada or nearby states . The plant price is $178,000 .00 FOB Sparks, Nevada . Nevada sales taxes (approximately 6 percent) are not included, and will be charged if applicable . Installation Installation costs include shipping to site, complete setup and startup costs . It is assumed that the operator will have two semi -skilled personnel (the future plant operators) available for two weeks during setup to assist with setup, and to learn pre-startup procedures . (If these personnel are not available, the costs shown below will increase $150 .00 per man-shift not furnished) . Startup assistance and training will be furnished one shift per day for two weeks following setup (Training may be delayed until sufficient process solution is available) . Sparks, Nevada, Bid for Carbon ADR Plant 18 June 1987 - page 2 Total cost of Installation, Startup and Training : $ 26,500 .00 Our rate for startup assistance beyond the above "installation" cost, for a KCA engineer familiar with carbon ADR plant practice, is $8,800 .00/ month, plus expenses, for time planned and committed on long-term basis, or $440 .00 to $580 .00 per Say for daily services, plus expenses . Optional extras are discussed in a later section . General Plant Description The proposed plant is a complete system for adsorbing gold and silver from cyanide solutions through upflow, fluidized carbon beds, followed by non-pressurized desorption using caustic, caustic-alcohol (preferred method) or caustic-glycol strip systems . The Plant is built conservatively oversize to permit operation in excess of design capacity . Gold and silver are recovered onto steel wool cathodes . Cathodes are direct-smelted in a 225-pound propane-fired tilting crucible furnace, which is mounted on an external concrete slab (slab and enclosure not furnished), Piping and pump systems are included for pumping solution from the pregnant pond through the columns and discharging to the barren pond ; and for pumping from the barren pond to an adjacent point leading to the heaps . The pumps will be "Tsurumi" submersible pumps mounted in floats or on slides on the pond berm . Pumps will be furnished complete with motor controllers and dual controls inside the plant and at the pond edge . The plant is designed to permit loading of carbon to 150 ounces gold per ton or better (depending on the system chemistry ; similar plants KCA has built achieve loading approaching 1000 ounces per ton), and stripping of two column loads simultaneously . When utilizing a 48-hour strip cycle (and 150 oz/ton loading) the plant is capable of recovering 3700 ounces gold per month . A 24-hour strip cycle can often be attained, which doubles gold production capacity . k Sparks, Nevada, Bid for Carbon ADR Plant 18 June 1987 - page 3 Descript ion of Included Items, Alternative 1 . The plant consists of the following items of equipment : one - column module container consisting of a 45-ft . semi-trailer with high quality floor, ceiling and wall insulation, internal fluorescent lighting, forced air (propane) heating/ventilation, good tires and brakes, external paint with client logo, internal fire extinguishers, one window, one window/escapeway one - recovery module container consisting of a 28-ft . semi-trailer with high quality floor, ceiling and wall insulation, internal fluorescent lighting, forced air (propane) heating/ventilation, good tires and brakes, external paint two - steel stairs for plant access when mounted at trailer height above ground six - adsorption/desorption/acid wash columns, 10 sq . ft . cross-sectional area, 5 .5 ft . settled carbon bed depth (8 ft . overall height), arranged as three sets of two columns each ; mild steel columns with epoxy lining one - DSM-type screen and sump for catching and recycling floating carbon one - pregnant solution pump one - barren solution pump one - shedding vortex flowmeter with totalizer two - floating pond intakes one - storage tank for strip solution one - 30 kW electric immersion heater system for heating of strip solution (propane heating may be optionally furnished) one - sink and countertop one - work table for cathode manufacture one - electrolytic cell and variable-output power supply, including cell hood and exhaust fan one - propane-fired tilting pot furnace with 225-pound crucible I A Sparks, Nevada, Bid for Carbon ADR Plant 18 June 1987 - page 4 one - main electrical switchbox for external electrical connection (only one connection is required, with other voltages derived internally) - valves : butterfly and ball valves, steel body with stainless steel working parts - piping : PVC and CPVC, some steel, depending on duty requirements - connections : flanged fitting will be used preferentially (if appropriate) - heat tracing and insulation : all external pipelines freeze protection : complete drain capabilities . Options and Additions The plant as quoted above is a complete plant capable of producing dore bullion . However, the following options and additions may be desired or required in specific instances . Prices quoted below are installed prices unless otherwise indicated ; they do not include Nevada Sales Tax, approximately 6 percent additional . Concrete Slab Below Trailer Modules . It is normally a good idea to mount the trailer modules on a 6-inch thick concrete slab with a curb and central drain to the pregnant pond . This slab should have dimensions 32 by 60 feet . KCA will install this slab as part of the plant setup for a cost of $7200 .00 . Pressure Strip option . The quoted plants are designed for non-pressurized stripping of carbon, at an operating temperature of 83°C . Most KCA plants are run using an ethanol strip system, although they can be operated using ethylene glycol or non-organic strips . We San provide the plants with the capability to strip using 260 F, 25 psi pressurized strip circuit for an additional cost of $120,000 .00 . Sparks, Nevada, Bid for Carbon ADR Plant 18 June 1987 - page 5 Strip Solution Heating Using Propane . The quoted plants required 30 kW of electric power for heating of strip solution during the preliminary phase of the strip cycle . If this power is not readily available, it is possible to heat the solution using a propane-fired heater . The additional cost to substitute propane heating for electric heating is $5000 .00 . Carbon Regeneration Furnace . For an operation using a 200 gpm plant (approximately 1200 tons ore per day), we do not recommend the installation of a carbon regeneration furnace . Normally, the activated carbon used in the system will maintain its activity sufficient to meet design conditions for slightly in excess of one year . The- Sterling, Nevada, plant, which is a similar design to the plant proposed here, has been running since 1981 with average carbon replacement every 14 months . Other KCA plants have similar operating experience . Once activity is diminished, the carbon can then be sent for custom regeneration in batches, or sold to a large operator . The cost to regenerate carbon will be approximately $12,000 .00 per regeneration cycle (probably, $12,000 .00 per year) . KCA will furnish an Allis-Chalmers rotary kiln designed for 50 pounds carbon per hour regeneration capacity, complete with screens, tanks, propane hookup, and carbon transfer facilities, all installed and operable, at a cost of $105,000 .00 in client's building or $160,000 .00 in a concrete-slab, steel-frame building . Smelting Furnace Slab, Building and Scrubber . The smelting furnace which is furnished with the plant may be operated by placing it on a gravel base or, preferably, a concrete slab measuring 10 x 20 feet . Open air installation and operation is sufficient, although a simple open-walled structure with corrugated steel roof is preferred . The quoted price for the plant does not include a slab or housing for the furnace . The installed price includes installation of the furnace in client's housing . if mercury is present in the ore, or if the furnace is to be housed inside a building, it may also be desirable to install a furnace hood, exhaust fan, and wet exhaust scrubber .
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