{"help": "https://data.gov.au/data/en/api/3/action/help_show?name=package_show", "success": true, "result": {"archived": false, "author_email": null, "contact_point": "clientservices@ga.gov.au", "creator_user_id": "c2fbbe4a-4ba0-4945-808b-67454605a4cf", "duplicate_score": 2, "geospatial_topic": [], "id": "97d97751-4b14-4ec1-9909-28b7f83d78f4", "isopen": false, "language": "eng", "license_id": "notspecified", "license_title": "notspecified", "maintainer": null, "maintainer_email": null, "metadata_created": "2025-10-17T02:35:07.525571", "metadata_modified": "2025-10-17T02:35:07.525578", "name": "the-value-of-historical-samples-for-regional-and-national-geochemical-and-mineralogical-charact", "notes": "Geochemical and mineralogical analysis of surficial materials (streams, soils, catchment samples, etc) can provide valuable information about the potential for mineral systems, and the background mineralogical and geochemical variation for a region. However, collecting new samples can be time consuming and expensive, particularly for regional-scale studies. Fortunately, Geoscience Australia has a large holding of archived samples from regional- to continental-scale geochemical studies conducted over the last 50 years, the majority collected at high sampling densities that would be cost-prohibitive today. Although all these samples have already been analysed, their vintage can mean that analyses were obtained by a variety of analytical methods, are of variable quality, and often only available for a small number of elements. As part of the Australian government\u2019s Exploring for the Future program, funding was dedicated to re-analyse ~9,000 samples from these legacy surveys. They were re-analysed for 63 elements (total content) at a single laboratory producing a seamless, internally consistent, high-quality dataset, providing valuable new insights.\n\nA large number (7,700) of these legacy samples were collected from north Queensland, predominantly in the Cape York \u2013 Georgetown area (5,472) \u2014 an area with both a wide-range of existing deposit types and known potential for many critical minerals. The sample densities of these studies, up to 1 sample per ~2.5 km2 for Georgetown, makes them directly applicable for determining local- and regional-scale areas of interest for mineral potential. Early interpretation of the Cape York \u2013 Georgetown data has identified several locations with stream sediments enriched in both heavy and light rare earth elements (maximum 4000 and 31,800 ppm, respectively), demonstrating the potential of this dataset, particularly for critical minerals. The greater sampling density means that these samples can also provide much more granular geochemical background information and contribute to our understanding of the lower density data commonly used in regional- and national-scale geochemical background studies.\n\nIn addition to the geochemical re-analysis of legacy surface samples, Geoscience Australia has also been undertaking mineral analysis of legacy continental-scale geochemical samples. The National Geochemical Survey of Australia (NGSA) sample archive has been utilised to provide a valuable new dataset. By separating and identifying heavy minerals (i.e., those with a specific gravity >2.9 g/cm3) new information about the mineral potential and provenance of samples can be gained. The Heavy Mineral Map of Australia (HMMA) project, undertaken in collaboration with Curtin University, has analysed the NGSA sample archive, with~81% coverage of the continent. The project has identified over 145 million individual mineral grains belonging to 163 unique mineral species. Preliminary analysis of the data has indicated that zinc minerals and native elements may be useful for mineral prospectivity. Due to the large amount of data generated as part of this HMMA project, a mineral network analysis tool has been developed to help visualise the relationship between minerals and aid in the interpretation of the data.\n\nAbstract presented to the Australian Institute of Geoscientists \u2013 ALS Friday Seminar Series: Geophysical and Geochemical Signatures of Queensland Mineral Deposits October 2023 (https://www.aig.org.au/events/aig-als-friday-seminar-series-geophysical-and-geochemical-signatures-of-qld-mineral-deposits/)", "num_resources": 2, "num_tags": 7, "organization": {"id": "91f054ec-d0c3-4d42-a89a-5daa2c7a6818", "name": "geoscience-australia-data", "title": "Geoscience Australia Data", "type": "organization", "description": "Harvester for Geoscience Australia Data", "image_url": "", "created": "2025-06-23T12:29:08.024111", "is_organization": true, "approval_status": "approved", "state": "active"}, "original_harvest_source": {"site_url": "https://ecat.ga.gov.au", "href": "https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/the-value-of-historical-samples-for-regional-and-national-geochemical-and-mineralogical-charact", "title": "Geoscience Australia"}, "owner_org": "91f054ec-d0c3-4d42-a89a-5daa2c7a6818", "private": false, "promotion_level": "0", "spatial": "{\"type\": \"Polygon\", \"coordinates\": [[[112.0, -44.0], [154.0, -44.0], [154.0, -9.0], [112.0, -9.0], [112.0, -44.0]]]}", "spatial_coverage": "{\"type\": \"Polygon\", \"coordinates\": [[[112.0, -44.0], [154.0, -44.0], [154.0, -9.0], [112.0, -9.0], [112.0, -44.0]]]}", "state": "active", "temporal_coverage_from": "2024-02-02 03:41:15", "title": "The value of historical samples for regional and national geochemical and mineralogical characterisation", "type": "dataset", "unpublished": false, "url": null, "version": null, "extras": [{"key": "harvest_object_id", "value": "cedf0f89-f13b-49ff-b82c-f210b81850d6"}, {"key": "harvest_source_id", "value": "00080910-39e7-408f-882c-e6e1eb6baadb"}, {"key": "harvest_source_title", "value": "Geoscience Australia"}], "resources": [{"cache_last_updated": null, "cache_url": null, "created": "2025-10-17T02:35:07.528143", "datastore_active": false, "datastore_contains_all_records_of_source_file": false, "description": "Link to Conference Page", "format": "HTML", "hash": "", "id": "07fcda1b-dfb4-41f5-b9c6-dcaf5e291838", "last_modified": null, "metadata_modified": "2025-10-17T02:35:07.515272", "mimetype": null, "mimetype_inner": null, "name": "Link to Conference Page", "package_id": "97d97751-4b14-4ec1-9909-28b7f83d78f4", "position": 0, "resource_locator_function": "", "resource_locator_protocol": "WWW:LINK-1.0-http--link", "resource_type": null, "size": null, "state": "active", "url": "https://www.aig.org.au/events/aig-als-friday-seminar-series-geophysical-and-geochemical-signatures-of-qld-mineral-deposits/", "url_type": null, "zip_extract": false}, {"cache_last_updated": null, "cache_url": null, "created": "2025-10-17T02:35:07.528149", "datastore_active": false, "datastore_contains_all_records_of_source_file": false, "description": "Link to download Conference Proceedings (page 3)", "format": "HTML", "hash": "", "id": "3e015592-ebec-4ebe-867c-806661f1c575", "last_modified": null, "metadata_modified": "2025-10-17T02:35:07.515424", "mimetype": null, "mimetype_inner": null, "name": "Link to download Conference Proceedings (page 3)", "package_id": "97d97751-4b14-4ec1-9909-28b7f83d78f4", "position": 1, "resource_locator_function": "", "resource_locator_protocol": "WWW:LINK-1.0-http--link", "resource_type": null, "size": null, "state": "active", "url": "https://www.aig.org.au/librar/seminar-presentations/qld-branch-presentations-events/", "url_type": null, "zip_extract": false}], "tags": [{"display_name": "ARF - Australia\u2019s Resources Framework", "id": "c8dd77f8-e3f1-4a5c-a7d5-cf40e51456b9", "name": "ARF - Australia\u2019s Resources Framework", "state": "active", "vocabulary_id": null}, {"display_name": "EFTF \u2013 Exploring For The Future", "id": "af0e2b2e-1ce4-4b6f-ae50-4d6ab9f929da", "name": "EFTF \u2013 Exploring For The Future", "state": "active", "vocabulary_id": null}, {"display_name": "Geochemistry", "id": "e3abf967-e82d-46fa-b59a-b7e0e79e7c52", "name": "Geochemistry", "state": "active", "vocabulary_id": null}, {"display_name": "Heavy Mineral Map of Australia", "id": "5045e5c8-964b-4dad-814a-a84866aa3089", "name": "Heavy Mineral Map of Australia", "state": "active", "vocabulary_id": null}, {"display_name": "Inorganic geochemistry", "id": "dc4d4ca6-0d26-4741-8b18-df4d20f0245b", "name": "Inorganic geochemistry", "state": "active", "vocabulary_id": null}, {"display_name": "Legacy Geochemistry", "id": "0de210fe-ab07-408e-ad02-c771cb8339b8", "name": "Legacy Geochemistry", "state": "active", "vocabulary_id": null}, {"display_name": "Published_External", "id": "5178775c-8044-4b7f-881f-5428a4e2d925", "name": "Published_External", "state": "active", "vocabulary_id": null}], "groups": [], "relationships_as_subject": [], "relationships_as_object": []}}