{"id":16379,"date":"2026-08-25T10:25:49","date_gmt":"2026-08-25T10:25:49","guid":{"rendered":"https:\/\/koshalsambada.in\/?p=16379"},"modified":"2026-08-25T10:25:49","modified_gmt":"2026-08-25T10:25:49","slug":"in-2006-south-dakota-began-turning-a-mine-that-produced-41-million-ounces-of-gold-into-americas-deepest-underground-lab-today-scientists-work-4850-feet-down-searching-for-dark-matter-and-n","status":"publish","type":"post","link":"https:\/\/koshalsambada.in\/?p=16379","title":{"rendered":"In 2006, South Dakota began turning a mine that produced 41 million ounces of gold into America\u2019s deepest underground lab; today scientists work 4,850 feet down searching for dark matter and neutrinos"},"content":{"rendered":"<p><br \/>\n<\/p>\n<div>\n<div class=\"e9jwa\">\n<div class=\"vdo_embedd\">\n<div class=\"GfdvZ\">\n<section class=\"_bIDB  clearfix id-r-component leadmedia undefined undefined  E9tg9 \" style=\"top:0px\">\n<div class=\"_bIDB\" data-ua-type=\"1\" onclick=\"stpPgtnAndPrvntDefault(event)\">\n<div class=\"ypVvZ\">\n<div class=\"WGttI\"><img src=\"https:\/\/static.toiimg.com\/thumb\/msid-133502720,imgsize-117227,width-400,height-225,resizemode-4\/solar-neutrino-experiment.jpg\" alt=\"In 2006, South Dakota began turning a mine that produced 41 million ounces of gold into America\u2019s deepest underground lab; today scientists work 4,850 feet down searching for dark matter and neutrinos\" title=\"Solar Neutrino Experiment 1 used a tank filled with chlorine-based perchloroethylene to detect neutrinos from the Sun.\" decoding=\"async\" fetchpriority=\"high\"\/><\/div>\n<\/div>\n<\/div>\n<div class=\"Ta7d_ img_cptn\"><span title=\"Solar Neutrino Experiment 1 used a tank filled with chlorine-based perchloroethylene to detect neutrinos from the Sun.\">Solar Neutrino Experiment 1 used a tank filled with chlorine-based perchloroethylene to detect neutrinos from the Sun.<\/span><\/div>\n<\/section>\n<\/div><\/div>\n<\/div>\n<p>A gold mine in South Dakota once produced millions of ounces of precious metal. Today, the same site is being used to study some of the biggest mysteries in the universe.<span class=\"id-r-component br\" data-pos=\"1\"\/>The Homestake Gold Mine in Lead, South Dakota, operated for 125 years before it closed in 2001. <!-- -->According to Sanford lab, during its lifetime, the mine produced about 41 million ounces of gold and 9 million ounces of silver, making it the largest and deepest gold mine in North America at the time.<span class=\"id-r-component br\" data-pos=\"5\"\/>The mine later took on a completely different when in 2006, businessman T Denny Sanford pledged $70 million to help revive plans for an underground research laboratory. Barrick Gold Corporation, which owned the Homestake property, donated land, while South Dakota committed more than $40 million to the project. <!-- -->The efforts led to the creation of the Deep Underground Science and Engineering Laboratory, now known as the Sanford Underground Research Facility (SURF), in 2007.<span class=\"id-r-component br\" data-pos=\"10\"\/>Today, SURF is the deepest underground laboratory in the United States, reaching 4,850 feet below the surface. Scientists from dozens of countries work there to study questions about the universe and Earth.<span class=\"id-r-component br\" data-pos=\"12\"\/><\/p>\n<p><h2>How mine became lab<\/h2>\n<\/p>\n<p><span class=\"id-r-component br\" data-pos=\"14\"\/>The idea of using the mine for science was not new at that time. Research had already begun there decades before mining even ended.<span class=\"id-r-component br\" data-pos=\"18\"\/>In the mid-1960s, physicist Raymond Davis Jr built the Brookhaven Solar Neutrino Experiment deep inside the Homestake Mine. His experiment used a 100,000-gallon tank filled with perchloroethylene, a chlorine-containing dry-cleaning fluid, to detect neutrinos coming from the Sun. He later recieved the Nobel Prize in Physics in 2022 for detecting cosmic neutrinos.<span class=\"id-r-component br\" data-pos=\"21\"\/>Neutrinos are extremely difficult to detect because they interact very weakly with matter. The experiment therefore needed protection from unwanted signals that could interfere with the measurements. The mine&#8217;s great depth provided an environment suited to this type of research.<span class=\"id-r-component br\" data-pos=\"23\"\/>Davis continued his work for nearly three decades in an underground area that later became known as the Davis Cavern. Scientists then began pushing for the site to be converted into a permanent underground research laboratory.<span class=\"id-r-component br\" data-pos=\"26\"\/><\/p>\n<div data-pos=\"0\" class=\"id-r-component iIpbx undefined  &#10;        \">\n<div><img decoding=\"async\" alt=\"Homestake gold mine\" msid=\"133502829\" imgsize=\"103837\" resizemode=\"4\" width=\"\" title=\"The historic Homestake gold mine (Photo: Library of Congress)\" placeholdersrc=\"https:\/\/static.toiimg.com\/photo\/83033472.cms\" offsetvertical=\"0\" placeholdermsid=\"47529300\" type=\"thumb\" class=\"\" src=\"https:\/\/static.toiimg.com\/photo\/imgsize-103837,msid-133502829\/homestake-gold-mine.jpg\" data-api-prerender=\"true\"\/><\/p>\n<p>The historic Homestake gold mine (Photo: Library of Congress)<\/p>\n<\/div>\n<\/div>\n<p><span class=\"id-r-component br\" data-pos=\"28\"\/><\/p>\n<p><h2>Search for dark matter<\/h2>\n<\/p>\n<p><span class=\"id-r-component br\" data-pos=\"30\"\/>Once the site was developed as a modern research facility, scientists began installing major physics experiments deep underground. One of the first was the Large Underground Xenon, or LUX, experiment. It was installed on the 4,850-foot level and was designed to search for dark matter.<span class=\"id-r-component br\" data-pos=\"32\"\/>Dark matter is a mysterious form of matter that scientists believe exists, but it has not been directly detected. It does not interact with light in the way ordinary matter does, making it difficult to study.<span class=\"id-r-component br\" data-pos=\"35\"\/>In October 2013, after an initial 80-day run, LUX was found to be the most sensitive dark matter detector in the world. Further analysis confirmed its sensitivity in 2016, the same year the experiment was decommissioned.<span class=\"id-r-component br\" data-pos=\"37\"\/>LUX was later followed by a second-generation experiment, LUX-ZEPLIN, or LZ. It began operating in 2021 and was announced as the world&#8217;s most sensitive dark matter detector when its first results were released on July 7, 2022.<span class=\"id-r-component br\" data-pos=\"40\"\/>The underground setting remains central to these experiments. SURF&#8217;s deep location allows scientists to conduct highly sensitive searches in an environment protected by thousands of feet of rock.<span class=\"id-r-component br\" data-pos=\"42\"\/><\/p>\n<p><h2>Looking for rare radioactive decay<\/h2>\n<\/p>\n<p><span class=\"id-r-component br\" data-pos=\"44\"\/>Another major experiment at SURF has been searching for something even more elusive. The Majorana Demonstrator operating from 2015 to 2021, was used to search for neutrinoless double-beta decay, a rare type of radioactive decay that has never been observed.<span class=\"id-r-component br\" data-pos=\"47\"\/>Finding this decay could help explain why matter exists in our Universe. The experiment&#8217;s final results, published in early 2023, showed that the techniques used by the collaboration could be applied to a much larger experiment.<span class=\"id-r-component br\" data-pos=\"49\"\/>The collaboration is now working with another germanium experiment to develop the Large Enriched Ge Experiment for Neutrinoless \u03b2\u03b2 Decay, or LEGEND.<span class=\"id-r-component br\" data-pos=\"52\"\/><\/p>\n<div data-pos=\"0\" class=\"id-r-component iIpbx undefined  &#10;        \">\n<div><img decoding=\"async\" alt=\"Raymond Davis Jr\" msid=\"133502958\" imgsize=\"69933\" resizemode=\"4\" width=\"\" title=\"The same year Davis received the Nobel Prize, the Homestake Mine closed.\" placeholdersrc=\"https:\/\/static.toiimg.com\/photo\/83033472.cms\" offsetvertical=\"0\" placeholdermsid=\"47529300\" type=\"thumb\" class=\"\" src=\"https:\/\/static.toiimg.com\/photo\/imgsize-69933,msid-133502958\/raymond-davis-jr.jpg\" data-api-prerender=\"true\"\/><\/p>\n<p>The same year Davis received the Nobel Prize, the Homestake Mine closed.<\/p>\n<\/div>\n<\/div>\n<p><span class=\"id-r-component br\" data-pos=\"54\"\/><\/p>\n<p><h2>Research beyond physics<\/h2>\n<\/p>\n<p><span class=\"id-r-component br\" data-pos=\"56\"\/>The extreme conditions underground have also opened the door to research outside particle physics.Scientists have studied microbial lifeforms living in the underground environment. <!-- -->Some of this research has been linked to questions about medicines, biofuels and carbon sequestration. SURF says research carried out there has also helped inform the search for life on Mars.<span class=\"id-r-component br\" data-pos=\"60\"\/>Geologists are also studying how hot fluids move through fractures in underground rock. The research could contribute to understanding geothermal energy and its potential for clean energy generation.<span class=\"id-r-component br\" data-pos=\"62\"\/>The underground spaces are also used for engineering research and training. SURF supports some commercial research and development, including Caterpillar&#8217;s MineStar tracking technology. Its underground areas are also used for civil and mining engineering training and mine rescue operations.<\/div>\n<p><br \/>\n<br \/><a href=\"https:\/\/timesofindia.indiatimes.com\/world\/us\/in-2006-south-dakota-began-turning-a-mine-that-produced-41-million-ounces-of-gold-into-americas-deepest-underground-lab-today-scientists-work-4850-feet-down-searching-for-dark-matter-and-neutrinos\/articleshow\/133500780.cms\" target=\"_blank\" rel=\"noopener\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Solar Neutrino Experiment 1 used a tank filled with chlorine-based perchloroethylene to detect neutrinos from the Sun. A gold mine in South Dakota once produced millions of ounces of precious metal. Today, the same site is being used to study some of the biggest mysteries in the universe.The Homestake Gold Mine in Lead, South Dakota, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16380,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31],"tags":[],"class_list":["post-16379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-31"],"magazineBlocksPostFeaturedMedia":{"thumbnail":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","medium":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","medium_large":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","large":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","1536x1536":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","2048x2048":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-small":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-small-tall":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-small-square":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-small-masonry":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-medium":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-medium-masonry":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-large":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg","blogsy-wide":"https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg"},"magazineBlocksPostAuthor":{"name":"admin","avatar":"https:\/\/secure.gravatar.com\/avatar\/8709732a479614e7a8aa24d3eb1b239f30dc6d90c61464ed495001e7a469d856?s=96&d=mm&r=g"},"magazineBlocksPostCommentsNumber":"0","magazineBlocksPostExcerpt":"Solar Neutrino Experiment 1 used a tank filled with chlorine-based perchloroethylene to detect neutrinos from the Sun. A gold mine in South Dakota once produced millions of ounces of precious metal. Today, the same site is being used to study some of the biggest mysteries in the universe.The Homestake Gold Mine in Lead, South Dakota, [&hellip;]","magazineBlocksPostCategories":["\u0b26\u0b47\u0b36 \u0b2c\u0b3f\u0b26\u0b47\u0b36"],"magazineBlocksPostViewCount":1,"magazineBlocksPostReadTime":4,"magazine_blocks_featured_image_url":{"full":["https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg",400,225,false],"medium":["https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg",300,169,false],"thumbnail":["https:\/\/koshalsambada.in\/wp-content\/uploads\/2026\/08\/solar-neutrino-experiment.jpg",150,84,false]},"magazine_blocks_author":{"display_name":"admin","author_link":"https:\/\/koshalsambada.in\/author\/admin"},"magazine_blocks_comment":0,"magazine_blocks_author_image":"https:\/\/secure.gravatar.com\/avatar\/8709732a479614e7a8aa24d3eb1b239f30dc6d90c61464ed495001e7a469d856?s=96&d=mm&r=g","magazine_blocks_category":"<a href=\"#\" class=\"category-link category-link-31\">\u0b26\u0b47\u0b36 \u0b2c\u0b3f\u0b26\u0b47\u0b36<\/a>","_links":{"self":[{"href":"https:\/\/koshalsambada.in\/index.php?rest_route=\/wp\/v2\/posts\/16379","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/koshalsambada.in\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/koshalsambada.in\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/koshalsambada.in\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/koshalsambada.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16379"}],"version-history":[{"count":0,"href":"https:\/\/koshalsambada.in\/index.php?rest_route=\/wp\/v2\/posts\/16379\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/koshalsambada.in\/index.php?rest_route=\/wp\/v2\/media\/16380"}],"wp:attachment":[{"href":"https:\/\/koshalsambada.in\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/koshalsambada.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16379"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/koshalsambada.in\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}