Arsenic Management

Stringent environmental regulations require arsenic management programs meaning sustainable arsenic practices are critical for profitable operation. S...

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SGS MINERALS SERVICES – T3 SGS 031

10-2013

ARSENIC MANAGEMENT Valuable gold, copper, cobalt and nickel resources can host significant quantities of arsenic. For instance: ••

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Recycle

The gold-arsenopyrite deposits of Red Lake, Yellowknife and Ashanti areas. The energite-tetrahedrite deposits of El Indio and El Pachon regions. The unconformity or vein related nickel-cobalt-arsenide ores of Key Lake, Jabiluka, Ranger or Cobalt camps.

Stringent environmental regulations require arsenic management programs meaning sustainable arsenic practices are critical for profitable operation.

Reject

METALLURGICAL PROCESSES Recover

This experience has helped many companies on the road to profitable, sustainable operation and regulatory compliance.

RECOVERY PRODUCTION OF MARKETABLE ARSENIC COMPOUNDS ••

SGS Minerals Services’ metallurgical group has successfully developed and completed numerous programs in which arsenic compounds have removed, rejected, recycled, fixed or detoxified. In doing so, we have resolved many of the difficult aspects of arsenic beneficiation, purification and stabilization.

Fixate

Su stainable Operation

With our metallurgical expertise in flow-sheet development, pilot plant operation and our fully equipped, accredited analytical, mineralogical and environmental laboratories, SGS Minerals Services has a wealth of experience for your project.

METALLURGICAL TREATMENT OF ARSENIC CONTAINING PRODUCTS

Detoxify

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Selective removal of arsenic minerals from impure compounds by flotation, re-leach/precipitation, crystallization of pure saleable sodium arsenate or copper arsenate Volatilization of pure arsenic compounds by roasting or precipitation

RECYCLING •• •• ••

Remediation of arsenic-containing materials Investigation of arsenic behavior during processing Selection of hazardous arsenic materials for in-process stabilization or concentration

FIXATION •• ••

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Production of stabilized arsenic compounds for safe disposal Pressure or atmospheric leach technologies produce stable crystalline scorodite and/or ferric arsenate precipitates. Smelter dusts, copper refinery bleed solutions, refractory gold ores and Co-Ni-Zn arsenide ores are possible feeds. Cement- or bitumen-stabilized arsenic waste products can be safely disposed.

ANALYSIS OF ARSENIC-BEARING MATERIALS SGS Minerals Services has many methods to characterize arsenic and its related impact:

SGS MINERALS SERVICES – T3 SGS 031 CHEMISTRY

MINERALOGY

STABILITY TESTING

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© SGS Group Management SA – 2013 – All rights reserved - SGS is a registered trademark of SGS Group Management SA

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Total arsenic by ICP-AES, ICP-MS, STP-GFAAS, GFAAS, GHAAS, XRF Analytical range1 ppb (solution) to 100% (solid) Arsenic speciation (As+3,As+5 ) by hydride AA in all matrices Analytical range 0.01 mg/L to 1% Toxic forms: organic and inorganic

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Arsenic mineral phase speciation, crystallinity, particle size and mineral chemistry Arsenic deportment in solid ores and test products Arsenic mineral associations and intergrowth textures Investigations performed using integrated XRD, QEMSCAN, optical microscopy, scanning electronic microscopy and electron microprobe analysis.

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Arsenic solubility via leach tests TCLP: Toxicity characteristic leaching procedure SPLP: Synthetic precipitation leaching procedures MWMP: Meteoric water mobility procedure Long term stability Column extraction Aging tests Weathering tests

CONTACT INFORMATION Email us at [email protected] www.sgs.com/mining Gold in arsenopyrite