[wartijn_]

You’re either severely overestimating the size of the mines or underestimating the size of Christmas Island. On satellite images[0]you can see where there has been phosphate mining, but it’s also very clear that it hasn’t replaced the habitat of the shrew.

[0] https://maps.app.goo.gl/3e55Y1Q3AvMSuccz6?g_st=ic