Canadave wrote:

Robert Maxwell wrote:

Canadave wrote:

I suppose, but I think the completist in me would get annoyed at the hidden row. 
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Ah, but there is no "hidden row." Think about it.
If most veins are 2x2, then having two parallel horizontal shafts with 3 blocks in between is guaranteed to expose the vein in at least one of the shafts.
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Oh yeah, I realize this, but it would still come off visually as one row being hidden. That would bother me.
And that's an impressive looking mineshaft, btw. I tend to dig down on a 45 degree angle, myself. Makes it a bit more work to get back to the surface, but I find it makes the digging process more flexible—I can avoid caves and lava pools if I want\need to.
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That actually used to be my strategy. On my last world, I zigzagged up and down, diagonally, across the landscape. What I found is that you go through shovels/pickaxes pretty quickly that way and the payoff isn't so great. The branching mineshaft strategy is much more productive as far as I have seen.
Digging the big shaft straight down was just for fun, really. That stone walkway at the very top leads from my base lobby (just a small workshop area in a shack) to an underground tree farm, connected to which is another workshop, a storage room, and then a corridor that leads to a ladder, which goes all the way up into that castle/tower in my other picture.

I like to have everything connected.