Hi KwaXoloXolo,

Is 'slimes dam' not a uniquely South African term for a tailings dam or tailings pond? Either way it is not the name of the dam or pond. Furthermore I don't think the tag landuse=landfill adequately describes the feature, a better tag would be https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dtailings_pond. Unfortunately this is not rendered by OSM and would require a campaign to have it rendered, possibly in a similar fashion to a landfill site.