Im going to answer a few questions im not sure got answered.
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In Palb. Mines there are about 6 mining spots on the first level, second level had about the same, give or take. The third Level DOES have spots, and a couple of NMs as well. There are 4-5 spots on the Third floor. All of them are in the four corners of the map.
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One is in the Room High NE with the scorp spawn.
One is in the Little Hook on the left side of the map.
One is At the very bottom Left side in the room with the Quadav eggs, and a NM spawns there, drops Marine Shield and Bonzes Circlet.
The last two spots are in the bottom right corner, above the splot of ink marking the dragon. They are in the rooms with the Mythral Seems, but dont Mine those, they yeild no ore, only gravel.
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The other NM is in H-7 of the mines on third floor, really bad spawn rate tho, varies too much, from an hour to anywhere around 3-4. He Drops the GSword Braveheart and Course Gauntlets.
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As for Gusgen, Most of the mining spots are far into the mines. There are one or two on each level from what ive seen. But the very bottom floor has 2, then the room next to it has one, and the floor right above that has at least one in each room.
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Gusgen is kinda nice because of the multiple darksteel ores you can get, But if you have the time I highly recommend Palb. Mines if its not busy. MOST (not all) spots are found at the end of a hall in a oval room that dead ends. "Cant give away all my secrets!"
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Pandemonium - RDM/BLM 75/37
Frostbite THF/NIN 75/37
PLD 52, WHM 37
RNG 28, WAR 37
Bastok Rank 10
RDM Maat (1/3)
RDM AF: 1(√) 2(√) 3(√) 4(√) 5(√) 6(√)
THF AF: 1(√) 2(√) 3(√) 4(√) 5(√) 6(√)
Goldsmithing 51
Ose(1/3), Lizzy(1/3), Golden Bat(5/6)
White Coney(1/2), Ge'Dha Evileye(1/4)
Geyser Lizard(3/7), Stray Mary(0/2)
Mysticmaker Profblix(1/3)