Question about gold mining

Recently, I've been started to grind some gold in order to get the max perk of my gdrag. However, since I seldom do mining, I only have 1.3m mithril powder and 140k gemstone powder and hotm 6.i bought a glossy mineral and a x655 and make around 2.8m gold per hour. Is there anyway to level up the powder more quickly?Also I would like to ask which perk,mining spread or mining fortune is better to level up first in term of gold mining