{"id":563,"date":"2026-03-04T04:00:05","date_gmt":"2026-03-04T02:00:05","guid":{"rendered":"https:\/\/reports.anglogoldashanti.com\/25\/?p=563"},"modified":"2026-03-26T09:05:55","modified_gmt":"2026-03-26T07:05:55","slug":"geita-water-management-milestone","status":"publish","type":"post","link":"https:\/\/reports.anglogoldashanti.com\/25\/sr\/case-studies\/geita-water-management-milestone\/","title":{"rendered":"Landmark water management milestone for Geita"},"content":{"rendered":"\n<div class=\"wp-block-columns alignfull is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:1000px\">\n<div class=\"wp-block-group alignwide has-global-padding is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-093a4edc wp-block-group-is-layout-constrained\" style=\"padding-right:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40)\">\n<h4 class=\"wp-block-heading alignfull has-teal-color has-text-color has-link-color wp-elements-176b00cf376505dd34f13a08dce4fd2c\">CASE STUDY:<\/h4>\n\n\n<h1 class=\"alignfull wp-block-post-title\">Landmark water management milestone for Geita<\/h1><\/div>\n\n\n\n<div class=\"wp-block-group has-super-light-gray-background-color has-background has-global-padding is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-ee438fcf wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--30);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--40)\">\n<p class=\"has-teal-color has-text-color has-link-color has-medium-font-size wp-elements-7ff9c4a76be20675f0a13d853c25395f wp-block-paragraph\">Geita has achieved a groundbreaking\nmilestone by introducing the first application\nof in-situ biological sulphate reduction\ntechnology on the African continent.<\/p>\n<\/div>\n\n\n\n<iframe loading=\"lazy\" width=\"100%\" height=\"500\" src=\"https:\/\/www.youtube.com\/embed\/PpehS17rh4w?rel=0\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-e56862fe wp-block-group-is-layout-constrained\" style=\"padding-right:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40)\">\n<p class=\"wp-block-paragraph\">This innovation has successfully reduced elevated sulphate (SO<sub>4<\/sub>) concentrations in groundwater below the regulatory guideline of 500mg\/L, delivering significant cost savings compared to conventional water treatment systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Over two decades of TSF operations, two localised sulphate hotspots developed to the northwest and southwest of the facility. Despite a natural 15-metre laterite-clay sequence designed to provide a basal barrier, structural conduits and shallow seepage resulted in elevated SO<sub>4<\/sub> levels in specific monitoring boreholes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The transition to bioremediation represents a move towards a more sustainable and costeffective approach to cleaning up locally impacted groundwater resources, offering a viable alternative to energy-intensive pump and treat options.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In 2020, Geita began trialling In-Situ Bioremediation (IBR), a process that promotes naturally occurring sulphate-reducing bacteria by injecting organic carbon sources, such as vegetable oil, to serve as bacterial food. This biological process converts SO4 to insoluble metal sulphides (typically FeS), lowering concentrations without requiring energy-intensive pumping infrastructure and artificial chemicals. Crucial to the longevity of the method is the way the injected carbon adheres to the subsurface matrix, creating an immobile and durable food source that sustains biological activity for years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, the technology is geologically sensitive; it is most effective in permeable, sand-like substrates \u2014 such as the pebble lag deposits and high-permeability buried river channels found at Geita \u2014 where reagents can be distributed evenly. In contrast, tighter geological matrices can restrict reagent movement and inhibit microbial activity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The 2019 pilot study at the northwestern hotspot successfully reduced SO<sub>4<\/sub> from approximately 650mg\/L to 150mg\/L, a four-fold decrease that has been sustained for over six years. Building on this success, a full-scale IBR programme was launched at the southwest hotspot in early 2024. The team installed a 100m bio-reactive barrier with boreholes drilled to depths of approximately 60m. Over five injection phases, 36t of reagents were introduced, resulting in a sustained five-fold reduction from approximately 1,800mg\/L to 400mg\/L.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While a landmark success, the project has required ongoing technical adjustments to maintain performance. Because initial geophysical surveys attempted for plume delineation proved inconclusive, the team relied on detailed hydrogeological mapping and validation drilling to target treatment zones.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Furthermore, a temporary increase in SO<sub>4<\/sub> in early 2025 at one borehole, located in a highpermeability buried river channel, was identified as potential reagent flushing downstream of the barrier. This is currently being addressed through emulsifier adjustments and follow-up injections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The IBR approach aligns with broader sustainability goals by requiring no long-term power supply and causing minimal surface disturbance. It is significantly more efficient than traditional approaches, with treatment costs at Geita estimated at 0.08 dollars per cubic metre \u2014 roughly eight times lower than conventional water treatment costs at other regional operations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By using hydrogeological mapping and targeted confirmation drilling to refine treatment zones, Geita is pivoting away from the installation of extensive reactive barriers and focusing on the targeted remediation of contamination plume hotspots along the TSF downstream perimeter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This work demonstrates that IBR can deliver measurable water-quality improvements while setting a first-of-its-kind benchmark for responsible tailings management and groundwater protection across Africa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-cover is-light sticky\" style=\"min-height:100vh;aspect-ratio:unset;\"><img loading=\"lazy\" decoding=\"async\" width=\"1580\" height=\"1700\" class=\"wp-block-cover__image-background wp-image-3515 size-large\" alt=\"\" src=\"https:\/\/reports.anglogoldashanti.com\/25\/wp-content\/uploads\/2026\/02\/cs-water-geita-1580x1700.jpg\" data-object-fit=\"cover\" srcset=\"https:\/\/reports.anglogoldashanti.com\/25\/wp-content\/uploads\/2026\/02\/cs-water-geita-1580x1700.jpg 1580w, https:\/\/reports.anglogoldashanti.com\/25\/wp-content\/uploads\/2026\/02\/cs-water-geita-1004x1080.jpg 1004w, https:\/\/reports.anglogoldashanti.com\/25\/wp-content\/uploads\/2026\/02\/cs-water-geita-768x826.jpg 768w, https:\/\/reports.anglogoldashanti.com\/25\/wp-content\/uploads\/2026\/02\/cs-water-geita-1428x1536.jpg 1428w, https:\/\/reports.anglogoldashanti.com\/25\/wp-content\/uploads\/2026\/02\/cs-water-geita-1904x2048.jpg 1904w\" sizes=\"auto, (max-width: 1580px) 100vw, 1580px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-0 has-background-dim\" style=\"background-color:#948174\"><\/span><div class=\"wp-block-cover__inner-container has-global-padding is-layout-constrained wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Geita has achieved a groundbreaking milestone by introducing the first application of in-situ biological sulphate reduction technology on the African continent.<\/p>\n","protected":false},"author":1,"featured_media":3518,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[18],"tags":[30],"class_list":["post-563","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-studies","tag-water"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Landmark water management milestone for Geita | Report Suite 2025<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reports.anglogoldashanti.com\/25\/sr\/case-studies\/geita-water-management-milestone\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" 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