Where on Google Earth No 601: the answer....

Chañarcillo Bonanza Silver Deposit

 (Just above the word "Google" on the satellite image in the origial post here:
https://wogesite601.blogspot.co.uk/2017/04/where-on-google-earth-number-601.html ).

Chañarcillo is one of the first of the fabulously rich bonanza silver deposits discovered in Chile during the early-mid 19th century. Silver was first found by Juan Godoy in 1832, leading to a nationwide silver rush in Chile, but production really took off after a railway was completed around 1860.

From Segerstrom (1962) 

"From 1860 to 1885 a dozen mines on 3 veins in the Chañarcillo district, the Corrida Colorada, Descubridora, and Candelaria, produced 2,500,000 kg of silver ... almost all of the production came from ... mines crowded within an area of about a third of a square mile."

These deposits were amazingly rich: at current prices, 2.5 million kg of silver would be worth nearly 1.4 billion dollars - not bad for a third of a square mile of ground.

The deposits were also noteworthy for magnificent specimens of silver minerals: especially proustite, and the silver halides chlorargyrite and bromargyrite. Chañarcillo is also the type locality for the zinc arsenate mineral, adamite.

From: https://wallaceterrycjr.com/2014/ Proustite, Chanarcillo, Chile.The main crystal is a little longer than 7 cm. Photograph provided by Paul Powhat.

From: http://www.geologypage.com/2014/07/proustite.html Proustite, Chanarcillo, Chile. The main crystal is ca. 3.8cm high.

 

The mines and town have been deserted for a long time, and are no longer producing silver, or specimens. However, Chañarcillo has probably produced more fine proustite specimens than any other locality on Earth, and such specimens are extremely valuable today.

There is a comprehensive guide to the mining district (in Spanish) here:

http://geovirtual2.cl/minas/Chanarcillo/chan00entrada.htm