Ryukyu Guild - Information

[Laura C.]

Supported by the Gas Mining Guild, they ran the mines on the planet to harvest important ores such as uranium and plutonium.
(...)
Their strong economic power gained through the mines of Miura support this new venture out into space to secure their stakes and uplift their own power.

The Ryukyu Guild runs the mining operations on planet, and due to the rising number of people living there, have formed a government of sorts within the last decade or so.

I thought that mining operations on surface of Miura are in lore made by Kishiro, what is also reason why they own the Okinawa´s refinery for processing the raw ores (Isehara).

Starting in late 813 A.S., the terraforming of Miura was initiated, with the construction of the Kishiro base in orbit beginning soon after. Upon landing, planetary geologists and terraforming engineers discovered vast deposits of a number of various rare ores, leading Kishiro to make the decision to begin large scale mining operations on the planet, despite it being during the terraforming process. Due to the desire by the GMG and Kishiro to reduce costs in an already expensive project, it was decided to use prisoners instead of ordinary workers, and they are shipped in from various prison stations to serve as a work force in the uranium mines.

It makes sense that Gas Miners Guild is focused on mining gas, giving ore mining to someone else and just taking part of the profit, respectively getting profit by their planet being terraformed for lower price.

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On a ragebreak. Or ragequit. Time will tell.