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[wobbly]

I'd basically like to mine the ore out of a river bank in a warm biome & wandering how to do it.

Edit: Can you pump fast enough for a non-swimming hauler to just grab them?

[Ysyua]

I'd basically like to mine the ore out of a river bank in a warm biome & wandering how to do it.

Edit: Can you pump fast enough for a non-swimming hauler to just grab them?

You can, it's a bit tricky though. If you build an under-river drain to help the pumps it's a lot easier. Basically just run a tunnel to the edge of the map, carve a fortification (the tunnel has to at least end in a stone layer), build a floodgate/door/bridge/whatever and then dig up into the river. Hope like hell your miner makes it out alive. I found this helps immensely in the river filling process.

[Arx]

Hope like hell your miner makes it out alive

I think if you put doors in the passage, the miner will go through them and close the water out behind them, and then you can link them to a lever to open them. I've never tried it, though.

[Niddhoger]

I'd basically like to mine the ore out of a river bank in a warm biome & wandering how to do it.

Edit: Can you pump fast enough for a non-swimming hauler to just grab them?

Just dam the river.  This is very easy if you have an aquifer to use as a "sponge," but draining off-map works too.  First, find out which end of hte map the water if flowing into and which its flowing out of.  The "upstream" edge will always be a full 7/7 of water.  Damn this off as close to the map edge as you can.  Yes, pump's can pull water out of a tile faster than it can enter the tile.  Use this to create a few floodgates/walls directly in hte river bed.  It helps immensely to choose a part of hte river at its narrowest.  Once done, the river should dry up soon enough.  You'll be free to mine out all hte gems/ore you want.  You can also then set up tunnels from the riverbed to get drowning chambers and reservoirs set up for your fort.

[wobbly]

Thanks all, last time I mucked with a river I managed to flood the world, so I've been avoiding trying again. Hopefully I'll have better luck this time....

[Niddhoger]

Thanks all, last time I mucked with a river I managed to flood the world, so I've been avoiding trying again. Hopefully I'll have better luck this time....

The trick is you need a proper "drain" for your screw pumps.  There are only two proper types of drains: Aquifer and edge-of-map.  Aquifers are just magical.  They are both infinite sources and sinks for water.  If you have one present, a quick couple of tiles to channel into it is all you need.  Edge-of-map means water flowing off the map edge effectively disappears.  You can't dig out the last tile bordering the edge, but you can carve it into a fortification.  Water flows freely down stairs, so you can just make a (wide) up/down stair into the first stone layer then dig to the map edge.  Carve those fortifications (since water can freely pass them) and begin working.  Note that screw pumps can't work OUT of stair tiles but have no problem pumping INTO them.  Also keep in mind that a single tile won't hold all the water being pumped into it.  To be safe, you can wall in the "drain" tiles to make sure water doesn't splash about/Urist McDerp doesn't trip into it.