Evil scientists create a tiny tiny black hole on a mountain top. They lose control of it and it starts oscillating back and forth through the earth. Punching holes and slowly eating up the earth.
I think the opening scene was that it punched a perfect dime size hole through a Russian aircraft carrier.
Definitely not the Benford book. It sounds a bit like Baxter’s Moonseed - the nasty bit gets loose on a hill in Scotland, but there are no real bad guys around, and it isn’t a black hole.
That does sound promising - from your cite "The Cold War totters toward a hot war after something punches a hole in a Soviet aircraft carrier and the Soviets blame the Americans. After similar incidents around the world, though, a more chilling explanation emerges. A black hole created in a scientific laboratory has plunged through Earth. "