How much powder do I need to make around 30m-40m per hour from mining??

[dracotix]

I have a maxed out divans set (5 chambers all perfect), pristing 5 recomb auspicious titanium drill x655 (amber polished engine + sunny side omelette), all perfect gemstone on that as well. Ill be using bal pet and ruby routes in magma fields for gemstone.

How much powder do I need? Also, should I upgrade mining fortune or speed with that powder?