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Ukraine is believed to have vast reserves of critical rare minerals like graphite, titanium and lithium beneath its soil.

The site's eventual closure was sealed when hairline cracks were found in the graphite bricks which make up its nuclear cores.

A selection of about 100 examples in graphite and acrylic on paper comprises a survey of the prolific L.A. artist, drawn from the Huntington archive of his work.

Local media, citing an Asturian spokesperson, reported that workers had been at the mine under a permit to extract minerals to produce graphite.

"Seventy percent of our critical minerals are still underground," explains Ihor Semko as he gives a tour of the Zavallya quarry - the largest graphite quarry in Europe - of which he is in charge.