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Alex Glover is a recently retired geologist who has spent decades hunting for valuable minerals in the hillsides and hollows of the Appalachian Mountains that surround Spruce Pine, North Carolina. The wooded mountains surrounding it, though, are rich in all kinds of desirable rocks, some valued for their industrial uses, some for their pure prettiness. But it’s the mineral in Glover’s bag — snowy white grains, soft as powdered sugar — that is by far the most important these days. It’s quartz, but not just any quartz. Spruce Pine, it turns out, is the source of the purest natural quartz — a species of pristine sand — ever found on Earth.

This ultra-elite deposit of silicon dioxide particles plays a key role in manufacturing the silicon used to make computer chips. In fact, there’s an excellent chance the chip that makes your laptop or cell phone work was made using sand from this obscure Appalachian backwater. Most of the world’s sand grains are composed of quartz, which is a form of silicon dioxide, also known as silica. High-purity silicon dioxide particles are the essential raw materials from which we make computer chips, fiber-optic cables, and other high-tech hardware — the physical components on which the virtual world runs.

In a normal year, demand for electric power in Chelan County grows by perhaps 4 megawatts ­­— enough for around 2,250 homes — as new residents arrive and as businesses start or expand. But since January 2017, as Bitcoin enthusiasts bid up the price of the currency, eager miners have requested a staggering 210 megawatts for mines they want to build in Chelan County. That’s nearly as much as the county and its 73,000 residents were already using. And because it is a public utility, the PUD staff is obligated to consider every request.

The scale of some new requests is mind-boggling. Until recently, the largest mines in Chelan County used five megawatts or less. In the past six months, by contrast, miners have requested loads of 50 megawatts and, in several cases, 100 megawatts. By comparison, a fruit warehouse uses around 2.5 megawatts.

Apple Inc. is in talks to buy long-term supplies of cobalt directly from miners for the first time, according to people familiar with the matter, seeking to ensure it will have enough of the key battery ingredient amid industry fears of a shortage driven by the electric vehicle boom…