SOLVED. Adult Sci Fi - Meteorite passes through Earth creating small entry hole & large exit hole. Diamond mine created at exit hole. Spoiler info in comments. [s]

[Kevin]

SF topic book I read around 2015. Geologist looks to uncover origins of a new diamond mine being mined by corporation in 3rd world country. Turns out it was a meteorite that passed through earth and exit hole is the diamond mine. Their team finds and inspects both the exit and entry holes.

Spoiler details: Further discovery points to alien civilization and the moon involvement.

Thank you if you know this one!

[Alan]

Sounds a bit like Impact by Douglas Preston.

[Kevin]

Yep. That's it. Thank you!