Ann: Opuwo Cobalt Resource Drilling Assays, page-20

I think that website is talking about rock chips and crap like that, not underground mining. It's basically obfuscation.


https://www.cobaltinstitute.org/ores-containing-cobalt.html

https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwj31a-MqNvYAhVFNrwKHZ_dAI8QFghIMAU&url=https://www.bgs.ac.uk/downloads/start.cfm?id=1400&usg=AOvVaw0mYqIIjK0hv9wX5YqihEiZ

	{caption}
1	Summary of main cobalt deposit types
2	{/caption}
3	Deposit type	Genetic process of formation	Typical economic grades	Major examples
4	Sediment hosted	Diagenetic processes in near-shore or saline lagoon environment convert sea water sulphates to sulphides and concentrate metallic elements sourced from sediments.	0.1-0.4%	Tenke Fungurume, Democratic Republic of Congo; Mt Isa, Australia
5	Hydrothermal and volcanogenic	Precipitation of minerals from hydrothermal fluids passing through the host rock.	0.1%	Bou Azzer, Morroco; Keretti, Finland
6	Magmatic sulphide	An immiscible liquid sulphide phase is concentrated in magmas. This phase preferentially collects and concentrates metallic elements such as cobalt.	0.1%	Norilsk, Russia; Sudbury, Ontario, Canada; Kambalda, Australia
7	Laterite	Tropical weathering causes the breakdown of cobalt silicates and sulphides in ultramafic bodies causing cobalt to become enriched in residual weathered rocks.	0.05-0.15%	Koniambo Massif, New Caledonia
8	Manganese nodules and cobalt-rich crusts	Ferromanganese oxide concretions on the sea floor become enriched in cobalt by extraction from sea water and pore fluids from muds.	Up to 2.5%	None currently economic

Table 2 Summary of main cobalt deposit types.

There's also a bunch of other considerations (I'm preaching to the converted), but from what B Borg told me, there's crap like arsenic etc in plenty of other setups. Obviously arsenic is not that great unless you like your heart enlarged.

This is what I understand anyhow, I could well be wrong.
(I'm no geologist so any clarity welcomed.)