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It is thought these ores were mined until at least 23 000 BC.

At Lion Cavern it is estimated that at least 1 200 tons of soft haematite ore, rich in specularite, had been removed in ancient timesfrom the ethnographic record of modern hunter-gatherers, for instance, as (internal and external) medication, as a food preservative, in tanning of hides, and as insect repellent (3–9).

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Four of these metals, arsenic, antimony , zinc and bismuth , were discovered in the thirteenth and fourteenth centuries, while platinum was discovered in the 16th century.

The other seven metals, known as the Metals of Antiquity, were the metals upon which civilization was based.

At Ngwenya, Middle Stone Age man tunnelled adits into the precipitous western face in search of iron pigments, the weathered ochreous forms of haematite (libomvu) near the surface, and the harder black glistening form of the ore called specularite (ludumare).

Archeological studies have identified ochre powder as an ingredient in the manufacture of compound adhesives (10).

Thus, the use of iron oxides for “symbolic” purposes should be viewed as a hypothesis that needs to be tested, rather than simply assumed.

"The flint mines at Spiennes are outstanding examples of the lithic mining of flint, which marked a seminal stage of human technological and cultural progress.

Spiennes is one of the best known examples of prehistoric flint mining.

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Process Metallurgy is one of the oldest applied sciences . Admittedly, its form at that time was rudimentary, but, to gain a perspective in Process Metallurgy, it is worthwhile to spend a little time studying the initiation of mankind's association with metals. Before the 19th century only 24 of these metals had been discovered and, of these 24 metals, 12 were discovered in the 18th century.