{"id":452,"date":"2019-09-26T11:56:00","date_gmt":"2019-09-26T15:56:00","guid":{"rendered":"https:\/\/actlabs.readyforlaunch.ca\/?page_id=452"},"modified":"2019-10-31T17:31:42","modified_gmt":"2019-10-31T21:31:42","slug":"heavy-minerals","status":"publish","type":"page","link":"https:\/\/actlabs.com\/fr\/geochemistry-analysis\/ores-concentrates-and-commodities\/heavy-minerals\/","title":{"rendered":"Heavy Minerals"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_5 1_5 fusion-one-fifth fusion-column-first fusion-no-small-visibility fusion-no-medium-visibility 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id=\"menu-item-751\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-751\"><a href=\"https:\/\/actlabs.com\/fr\/geochemistry-analysis\/quality-assurance\/\"><span class=\"link-text\"> Quality Assurance<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-3579\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3579\"><a href=\"https:\/\/actlabs.com\/fr\/actlabs-downloads\/geochemistry-resources\/\"><span class=\"link-text\"> Geochemistry Resources<\/span><span class=\"arrow\"><\/span><\/a><\/li><\/ul><\/nav><\/div><div class=\"fusion-additional-widget-content\"><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div>\n<div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_3_4 3_4 fusion-three-fourth fusion-column-last\" style=\"--awb-bg-size:cover;width:75%;width:calc(75% - ( ( 6% ) * 0.75 ) );\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-column-wrapper-legacy\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-one\"><h1 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">HEAVY MINERAL CONCENTRATES<\/h1><\/div><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-text fusion-title-size-two\"><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">Heavy minerals can be concentrated from glacial till samples or from stream sediments.<\/h2><\/div><div class=\"fusion-text fusion-text-1\"><p>The theory behind the use of heavy mineral concentrates relies on the fact that by concentrating the heavy mineral fraction from the sample, the dilutant light minerals which may obscure an anomaly derived from a deposit are eliminated, providing a clearer picture. This allows the minerals to be examined under a binocular microscope, SEM or electron microprobe for particle shape or composition. Particle shape of gold grains will commonly identify distance to source. Very abraded grains may have travelled a long distance whereas delicate angular grains are probably more local. Similarly for diamond exploration, the presence of certain mineral phases may indicate the distance to the source kimberlites. Bulk analysis of heavy minerals provides a rapid, low cost method to screen large volumes of samples. Samples with appropriate chemistry can then be further evaluated as the INAA technique is non-destructive.<\/p>\n<p>Heavy mineral concentrates are usually prepared by tabling or wet sieving a very large sampleof till or stream sediments (up to 20 kg may be routine). The heavy mineral concentrate collected at this stage is then further processed with heavy liquids using methylene iodide (SG = 3.3). The resultant concentrate then is separated into magnetic and non-magnetic fractions and it is the non-magnetic fraction which is usually analyzed. In some cases more elaborate separations include separating paramagnetic fractions and sieving to various particle sizes before analysis. This may provide further insight into identifying the source of the heavy minerals. Both gold and diamond mines have been discovered using this technology.<\/p>\n<\/div><div class=\"accordian fusion-accordian\" style=\"--awb-border-size:1px;--awb-icon-size:13px;--awb-content-font-size:18px;--awb-icon-alignment:left;--awb-hover-color:#f9f9f9;--awb-border-color:rgba(204,204,204,0);--awb-background-color:#f9f9f9;--awb-divider-color:#e0dede;--awb-divider-hover-color:#e0dede;--awb-icon-color:#ffffff;--awb-title-color:#1e99df;--awb-content-color:#4f4d4d;--awb-icon-box-color:#1a80b6;--awb-toggle-hover-accent-color:#1a80b6;--awb-title-font-family:&quot;Open Sans&quot;;--awb-title-font-weight:regular;--awb-title-font-style:normal;--awb-title-font-size:18px;--awb-title-line-height:1.2;--awb-content-font-family:&quot;Open Sans&quot;;--awb-content-font-style:normal;--awb-content-font-weight:400;\"><div class=\"panel-group fusion-toggle-icon-boxed\" id=\"accordion-452-1\"><div class=\"fusion-panel panel-default panel-8defc78a6ec323fe3 fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_8defc78a6ec323fe3\"><a aria-expanded=\"false\" aria-controls=\"8defc78a6ec323fe3\" role=\"button\" data-toggle=\"collapse\" data-target=\"#8defc78a6ec323fe3\" href=\"#8defc78a6ec323fe3\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">3A- Thermal Irradiation - INAA<\/span><\/a><\/h4><\/div><div id=\"8defc78a6ec323fe3\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_8defc78a6ec323fe3\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p>INAA (Instrumental Neutron Activation Analysis) is an analytical technique dependent on measuring gamma radiation induced in the sample by irradiation with neutrons. The primary source of neutrons for irradiation is usually a nuclear reactor. Each activated element emits a \u00ab\u00a0fingerprint\u00a0\u00bb of gamma radiation which can be measured and quantified. Routine multi-element analyses by INAA are performed on practically any material from the smallest sample which can be weighed accurately to very large samples.<\/p>\n<p>A 30 g aliquot, if available, is encapsulated in a polyethylene vial and irradiated along with flux wires at a thermal neutron flux of 7 x 10 12 ncm-2 s-1. After a 7-day period to allow Na-24 to decay the samples are counted on a high purity Ge detector with resolution of better than 1.7 KeV for the 1332 KeV Co-60 photopeak. Using the flux wires and control standards, the decay-corrected activities are compared to a calibration developed from multiple certified international reference materials. For values exceeding the upper limits, assays are recommended. One standard is run for every 11 samples. One blank is analyzed per work order. Duplicates are analyzed when sample material is available.<\/p>\n<p>3A (Heavy Mineral Concentrates) Elements and Detection Limits (ppm)<\/p>\n<div id=\"footable_parent_1057\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_0\" data-footable_id=\"1057\" data-filter-delay=\"1000\" aria-label=\"3A- Thermal Irradiation - INAA - 1:3.csv\"            id=\"footable_1057\"\n           data-unique_identifier=\"ninja_table_unique_id_985500808_1057\"\n           class=\" foo-table ninja_footable foo_table_1057 ninja_table_unique_id_985500808_1057 ui table  nt_type_legacy_table selectable celled striped compact vertical_centered  footable-paging-right ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                            <col class=\"ninja_column_2 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_element \">\ufeffElement<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_detectionlimit \">Detection Limit<\/th><th scope=\"col\"  class=\"ninja_column_2 ninja_clmn_nm_upperlimit \">Upper Limit<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"3909\" class=\"ninja_table_row_0 nt_row_id_3909\">\n            <td>Ag<\/td><td>5<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3910\" class=\"ninja_table_row_1 nt_row_id_3910\">\n            <td>As<\/td><td>2<\/td><td>100,000<\/td>        <\/tr>\n            <tr data-row_id=\"3911\" class=\"ninja_table_row_2 nt_row_id_3911\">\n            <td>Au<\/td><td>5 ppb<\/td><td>30,000 ppb<\/td>        <\/tr>\n            <tr data-row_id=\"3912\" class=\"ninja_table_row_3 nt_row_id_3912\">\n            <td>Ba<\/td><td>200<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3913\" class=\"ninja_table_row_4 nt_row_id_3913\">\n            <td>Br<\/td><td>5<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3914\" class=\"ninja_table_row_5 nt_row_id_3914\">\n            <td>Ca<\/td><td>1%<\/td><td>50%<\/td>        <\/tr>\n            <tr data-row_id=\"3915\" class=\"ninja_table_row_6 nt_row_id_3915\">\n            <td>Ce<\/td><td>3<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3916\" class=\"ninja_table_row_7 nt_row_id_3916\">\n            <td>Co<\/td><td>5<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3917\" class=\"ninja_table_row_8 nt_row_id_3917\">\n            <td>Cr<\/td><td>10<\/td><td>100,000<\/td>        <\/tr>\n            <tr data-row_id=\"3918\" class=\"ninja_table_row_9 nt_row_id_3918\">\n            <td>Cs<\/td><td>2<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3919\" class=\"ninja_table_row_10 nt_row_id_3919\">\n            <td>Eu<\/td><td>0.2<\/td><td>2000<\/td>        <\/tr>\n            <tr data-row_id=\"3920\" class=\"ninja_table_row_11 nt_row_id_3920\">\n            <td>Fe<\/td><td>0.02%<\/td><td>75%<\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n\n<div id=\"footable_parent_1059\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_1\" data-footable_id=\"1059\" data-filter-delay=\"1000\" aria-label=\"3A- Thermal Irradiation - INAA - 2:3.csv\"            id=\"footable_1059\"\n           data-unique_identifier=\"ninja_table_unique_id_2540472203_1059\"\n           class=\" foo-table ninja_footable foo_table_1059 ninja_table_unique_id_2540472203_1059 ui table  nt_type_legacy_table selectable celled striped compact vertical_centered  footable-paging-right ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                            <col class=\"ninja_column_2 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_element \">\ufeffElement<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_detectionlimit \">Detection Limit<\/th><th scope=\"col\"  class=\"ninja_column_2 ninja_clmn_nm_upperlimit \">Upper Limit<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"3921\" class=\"ninja_table_row_0 nt_row_id_3921\">\n            <td>Hf<\/td><td>1<\/td><td>5000<\/td>        <\/tr>\n            <tr data-row_id=\"3922\" class=\"ninja_table_row_1 nt_row_id_3922\">\n            <td>Hg<\/td><td>5<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3923\" class=\"ninja_table_row_2 nt_row_id_3923\">\n            <td>Ir<\/td><td>50 ppb<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3924\" class=\"ninja_table_row_3 nt_row_id_3924\">\n            <td>La<\/td><td>1<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3925\" class=\"ninja_table_row_4 nt_row_id_3925\">\n            <td>Lu<\/td><td>0.05<\/td><td>1000<\/td>        <\/tr>\n            <tr data-row_id=\"3926\" class=\"ninja_table_row_5 nt_row_id_3926\">\n            <td>Mo<\/td><td>20<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3927\" class=\"ninja_table_row_6 nt_row_id_3927\">\n            <td>Na<\/td><td>0.05%<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3928\" class=\"ninja_table_row_7 nt_row_id_3928\">\n            <td>Nd<\/td><td>10<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3929\" class=\"ninja_table_row_8 nt_row_id_3929\">\n            <td>Ni<\/td><td>200<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3930\" class=\"ninja_table_row_9 nt_row_id_3930\">\n            <td>Rb<\/td><td>50<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3931\" class=\"ninja_table_row_10 nt_row_id_3931\">\n            <td>Sb<\/td><td>0.2<\/td><td>10,000<\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n\n<div id=\"footable_parent_1063\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_2\" data-footable_id=\"1063\" data-filter-delay=\"1000\" aria-label=\"3A- Thermal Irradiation - INAA - 3:3.csv\"            id=\"footable_1063\"\n           data-unique_identifier=\"ninja_table_unique_id_546392979_1063\"\n           class=\" foo-table ninja_footable foo_table_1063 ninja_table_unique_id_546392979_1063 ui table  nt_type_legacy_table selectable celled striped compact vertical_centered  footable-paging-right ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                            <col class=\"ninja_column_2 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_element \">\ufeffElement<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_detectionlimit \">Detection Limit<\/th><th scope=\"col\"  class=\"ninja_column_2 ninja_clmn_nm_upperlimit \">Upper Limit<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"3932\" class=\"ninja_table_row_0 nt_row_id_3932\">\n            <td>Sc<\/td><td>0.1<\/td><td>1000<\/td>        <\/tr>\n            <tr data-row_id=\"3933\" class=\"ninja_table_row_1 nt_row_id_3933\">\n            <td>Se<\/td><td>20<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3934\" class=\"ninja_table_row_2 nt_row_id_3934\">\n            <td>Sm<\/td><td>0.1<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3935\" class=\"ninja_table_row_3 nt_row_id_3935\">\n            <td>Sr<\/td><td>0.20%<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3936\" class=\"ninja_table_row_4 nt_row_id_3936\">\n            <td>Ta<\/td><td>1<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3937\" class=\"ninja_table_row_5 nt_row_id_3937\">\n            <td>Tb<\/td><td>2<\/td><td>-<\/td>        <\/tr>\n            <tr data-row_id=\"3938\" class=\"ninja_table_row_6 nt_row_id_3938\">\n            <td>Th<\/td><td>0.5<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3939\" class=\"ninja_table_row_7 nt_row_id_3939\">\n            <td>U<\/td><td>0.5<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3940\" class=\"ninja_table_row_8 nt_row_id_3940\">\n            <td>W<\/td><td>4<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3941\" class=\"ninja_table_row_9 nt_row_id_3941\">\n            <td>Yb<\/td><td>0.2<\/td><td>1000<\/td>        <\/tr>\n            <tr data-row_id=\"3942\" class=\"ninja_table_row_10 nt_row_id_3942\">\n            <td>Zn<\/td><td>200<\/td><td>100,000<\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n\n<p><strong>Reference:<\/strong><br \/>\nHoffman, E.L., 1992. Instrumental Neutron Activation in Geoanalysis. Journal of Geochemical Exploration, volume 44, pp. 297-319.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-panel panel-default panel-5827992bc551f92c3 fusion-toggle-no-divider fusion-toggle-boxed-mode\"><div class=\"panel-heading\"><h4 class=\"panel-title toggle\" id=\"toggle_5827992bc551f92c3\"><a aria-expanded=\"false\" aria-controls=\"5827992bc551f92c3\" role=\"button\" data-toggle=\"collapse\" data-target=\"#5827992bc551f92c3\" href=\"#5827992bc551f92c3\"><span class=\"fusion-toggle-icon-wrapper\" aria-hidden=\"true\"><i class=\"fa-fusion-box active-icon awb-icon-minus\" aria-hidden=\"true\"><\/i><i class=\"fa-fusion-box inactive-icon awb-icon-plus\" aria-hidden=\"true\"><\/i><\/span><span class=\"fusion-toggle-heading\">3C \u2013 Base Metals \u2013 Aqua Regia \u2013 ICP<\/span><\/a><\/h4><\/div><div id=\"5827992bc551f92c3\" class=\"panel-collapse collapse \" aria-labelledby=\"toggle_5827992bc551f92c3\"><div class=\"panel-body toggle-content fusion-clearfix\">\n<p>0.5 g of sample is digested with aqua regia for 2 hours at 95oC. Sample is cooled then diluted with deionized water and homogenized. The samples are then analyzed using a Perkin Elmer ICP.<\/p>\n<p>3C (HMC Base Metals) Elements and Detection Limits (ppm)<\/p>\n<div id=\"footable_parent_1064\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_3\" data-footable_id=\"1064\" data-filter-delay=\"1000\" aria-label=\"3C \u2013 Base Metals \u2013 Aqua Regia \u2013 ICP.csv\"            id=\"footable_1064\"\n           data-unique_identifier=\"ninja_table_unique_id_3469350162_1064\"\n           class=\" foo-table ninja_footable foo_table_1064 ninja_table_unique_id_3469350162_1064 ui table  nt_type_legacy_table selectable celled striped compact vertical_centered  footable-paging-right ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                            <col class=\"ninja_column_2 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_element \">\ufeffElement<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_detectionlimit \">Detection Limit<\/th><th scope=\"col\"  class=\"ninja_column_2 ninja_clmn_nm_upperlimit \">Upper Limit<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"3943\" class=\"ninja_table_row_0 nt_row_id_3943\">\n            <td>Ag<\/td><td>0.2<\/td><td>100<\/td>        <\/tr>\n            <tr data-row_id=\"3944\" class=\"ninja_table_row_1 nt_row_id_3944\">\n            <td>Cd<\/td><td>0.5<\/td><td>5,000<\/td>        <\/tr>\n            <tr data-row_id=\"3945\" class=\"ninja_table_row_2 nt_row_id_3945\">\n            <td>Cu<\/td><td>1<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3946\" class=\"ninja_table_row_3 nt_row_id_3946\">\n            <td>Mn<\/td><td>2<\/td><td>100,000<\/td>        <\/tr>\n            <tr data-row_id=\"3947\" class=\"ninja_table_row_4 nt_row_id_3947\">\n            <td>Mo<\/td><td>2<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3948\" class=\"ninja_table_row_5 nt_row_id_3948\">\n            <td>Ni<\/td><td>1<\/td><td>10,000<\/td>        <\/tr>\n            <tr data-row_id=\"3949\" class=\"ninja_table_row_6 nt_row_id_3949\">\n            <td>Pb<\/td><td>2<\/td><td>5,000<\/td>        <\/tr>\n            <tr data-row_id=\"3950\" class=\"ninja_table_row_7 nt_row_id_3950\">\n            <td>S<\/td><td>0.01%<\/td><td>10%<\/td>        <\/tr>\n            <tr data-row_id=\"3951\" class=\"ninja_table_row_8 nt_row_id_3951\">\n            <td>Zn<\/td><td>1<\/td><td>10,000<\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n\n<p><strong>Notes:<\/strong><\/p>\n<p>Extraction of each element by Aqua 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