For example, the Australian state of New South Wales provides this in their online map tool:
https://minview.geoscience.nsw.gov.au
Click "Add layer", then "Geochemistry", then "All surface geochemistry". MinView from GSNSW is probably one of the better tools, anywhere in the world. Finding something like that on a global scale is impossible. You will be probably luckier with the more developed countries which invest quite a lot into this thing (like Australia and its states).