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ACZ\u2019s large geochemistry department has over 40 years of experience performing mining-specific static and kinetic testing for acid rock drainage (ARD) or acid mine drainage (AMD) prediction, as well as metal leaching (ML) tests. ACZ Laboratories was founded in 1980 to provide environmental analytical support services to the mining industry in the Western U.S. Today, ACZ is an analytical laboratory with inorganic, organic, and radiochemical capabilities and meets the needs of precious metal, base-metal, coal, and uranium mining operations throughout the world. ACZ\u2019s main client base is still the mining industry, and approximately sixty to seventy percent of current client revenue comes from this thriving global industry.<\/p>\n
ACZ has the analytical services and experienced staff to meet the specialized needs associated with the mining industry, from baseline studies and permitting to operational monitoring requirements through closure. Mining corporations and their consultants worldwide choose ACZ for its turnkey capabilities and high-quality defensible data delivered in a consistent and timely manner.<\/p>\n
[\/et_pb_text][et_pb_image src=”\/wp-content\/uploads\/2020\/04\/Geochemistry.png” _builder_version=”4.16″ custom_padding=”|10px||10px|false|false” animation_style=”fade” box_shadow_style=”preset4″ box_shadow_color=”#ba141a” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.16″ min_height=”713.5px” custom_padding=”21px|10px|25px|10px|false|false” global_colors_info=”{}”]<\/p>\n
Acid-Base Accounting (ABA)<\/span><\/p>\n Acid-Base Accounting is a dependable criterion by which overburden materials can be evaluated. An acid-base account consists of two measurements: 1) total or pyritic sulfur and 2) neutralization potential. The accounting balances the maximum potential acidity against total neutralizers in the sample.<\/p>\n The total or pyritic sulfur content accurately quantifies the potential acidity of materials when all sulfur is present as a pyritic mineral. When gypsum is found in an overburden sample or the materials are weathered, sulfur occurs in the form of sulfates. Samples high in organic carbon usually contain organic sulfur. When part of the sulfur occurs in non-acid-producing forms, the maximum potential acidity, as calculated, will be too high. It is for this reason that such calculations are referred to as maximums and that in doubtful cases, appropriate acid and water leachings should be made to rule out those forms of sulfur which do not produce acid. Then, from the stoichiometric equation of pyrite oxidation, the maximum potential acidity can be calculated in terms of calcium carbonate required to neutralize 1000 tons of the material. The neutralization potential of overburden materials (the second component of a net acid-base account) measures the amount of neutralizers present on the overburden materials. This measurement is found by treating a sample with a known amount of standardized hydrochloric acid, heating to assure complete reaction, and titrating with a standardized base. The result is then expressed in calcium carbonate equivalents. When balanced against acidity from the total sulfur measurement, a net acid-base account can be made.<\/p>\n ACZ Laboratories holds certification from the State of Nevada for acid-base accounting methods. \u00a0Nevada is currently the only state agency offering this certification.<\/p>\n [\/et_pb_text][et_pb_image src=”\/wp-content\/uploads\/2021\/02\/Humidity-Weathering-Cells-HCT-1-Web.jpg” alt=”Humidity Weathering Cells HCT, Geochemistry” title_text=”Humidity Weathering Cells HCT, Geochemistry” _builder_version=”4.16″ custom_margin=”-5px|||||” custom_padding=”|10px||10px|false|false” animation_style=”fade” box_shadow_style=”preset4″ box_shadow_color=”#ba141a” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ min_height=”795.1px” custom_padding=”21px|10px|20px|10px|false|false” global_colors_info=”{}”]<\/p>\n Humidity Cell Testing (HCT)<\/span><\/p>\n Since 1980, ACZ has been supporting the global mining industry\u2019s specialized needs, from baseline studies to operational water quality monitoring, plus static and kinetic testing for acid rock drainage prediction (ARD). ACZ Laboratories offers Humidity Cell Testing (HCT) via ASTM D5744-13 in a new state-of-the-art laboratory. HCT is designed to simulate in-situ weathering of waste rock and tailings in a controlled laboratory setting. ACZ\u2019s highly experienced staff, quality assurance program, as well as state and national certifications (NELAP) ensure our clients\u2019 data is accurate, defensible, and reproducible. All analyses are performed in accordance with globally recognized standards (ISO 17025). Partnering with ACZ is a commitment to quality and a guarantee of personalized service.<\/p>\n Leaching Environmental Assessment Framework (LEAF) methods have been designed to consider the effect of key environmental conditions and waste properties on leaching. These include: evaluating the partitioning of constituents between liquid and solid phases at or near equilibrium conditions over a wide range of pH values, evaluating constituent releases from solid materials as a function of cumulative liquid-to-solid ratio, and determining the rate of mass transport from either monolithic materials or compacted granular materials as a function of time using deionized water as the leaching solution.<\/p>\n [\/et_pb_text][et_pb_image src=”\/wp-content\/uploads\/2025\/09\/xrd-edited-scaled-e1758567801630.png” alt=”Humidity Weathering Cells HCT, Geochemistry” title_text=”xrd edited” _builder_version=”4.27.4″ custom_padding=”|10px||10px|false|false” animation_style=”fade” box_shadow_style=”preset4″ box_shadow_color=”#ba141a” locked=”off” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” min_height=”168.8px” custom_margin=”18px|||10px||” custom_padding=”0px|||||” global_colors_info=”{}”]<\/p>\n This service supports our clientele\u2019s environmental monitoring and material characterization needs. Samples can be analyzed using one or multiple of the following analyses:<\/span> Quantitative XRD Analysis with Rietveld Refinement for the precise identification of mineral phases, Semi-Quantitative XRD Analysis for the estimation of mineral concentrations in samples, and Clay Speciation for detailed identification and concentration estimates of individual clay minerals (<2 \u00b5m).<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ disabled_on=”off|off|off” _builder_version=”4.4.6″ background_color=”#191919″ custom_padding=”17px||0px||false|false” global_module=”1399″ global_colors_info=”{}”][et_pb_row _builder_version=”4.16″ custom_padding=”1px||1px||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_social_media_follow icon_color=”#ffffff” use_icon_font_size=”on” icon_font_size=”19px” _builder_version=”4.17.4″ text_orientation=”left” custom_margin=”7px||||false|false” custom_padding=”1px||1px||false|false” global_colors_info=”{}”][et_pb_social_media_follow_network social_network=”linkedin” url=”https:\/\/www.linkedin.com\/company\/2283256″ icon_color=”#000000″ _builder_version=”4.16″ background_color=”#ffffff” background_enable_color=”on” global_colors_info=”{}” follow_button=”off” url_new_window=”on”]linkedin[\/et_pb_social_media_follow_network][et_pb_social_media_follow_network social_network=”facebook” url=”https:\/\/www.facebook.com\/ACZLaboratoriesInc” icon_color=”#000000″ _builder_version=”4.16″ background_color=”#ffffff” background_enable_color=”on” global_colors_info=”{}” follow_button=”off” url_new_window=”on”]facebook[\/et_pb_social_media_follow_network][et_pb_social_media_follow_network social_network=”twitter” url=”https:\/\/twitter.com\/ACZLaboratories” icon_color=”#000000″ _builder_version=”4.16″ background_color=”#ffffff” background_enable_color=”on” global_colors_info=”{}” follow_button=”off” url_new_window=”on”]twitter[\/et_pb_social_media_follow_network][\/et_pb_social_media_follow][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" GeochemistryACZ\u2019s large geochemistry department has over 40 years of experience performing mining-specific static and kinetic testing for acid rock drainage (ARD) or acid mine drainage (AMD) prediction, as well as metal leaching (ML) tests. ACZ Laboratories was founded in 1980 to provide environmental analytical support services to the mining industry in the Western U.S. Today, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-307","page","type-page","status-publish","hentry"],"yoast_head":"\n\n
Leaching Environmental Assessment Framework (LEAF) Methods (EPA 1313, EPA 1314, EPA 1315, & EPA 1316)<\/h5>\n
X-Ray Diffraction (XRD)<\/span><\/h4>\n