As far as the Manila mint, I can tell you that it was originally built by the Spanish, who used it to produce minors in the late 19th century, although the big pesos (equivalent to 5 Peseta pieces) were struck in Spain. This was probably because the machinery was all manually-operated, rather than steam-powered. I have a 10 centavos-de-peso piece of Alfonso, with the boy head, from this mint.
When the US forces arrived, they found that it was in some condition of disrepair, with a substantial amount of machinery still sitting in the crates it had been packed in when sent out from Spain perhaps decades before. There was considerable debate, as part of the overall Philippine currency question, on the question of refurbishing it & setting it going to produce, at the very least, small change ; but in the event, all the coinage for the Islands was executed in the US, generally at San Francisco, for years afterward.
This I learned from reading reports of the US military government, now available on-line. Very informative.