Some noob mining questions

I guess the most basic question is simply, is mining worthwhile?
This is all back-of-the-envelope, but 20 wood takes a little bit, turning it into coal requires you lead coal production pretty heavily. You need to then dig, chip, and haul some lime. You then burn, mine, and chip the ore. You also need fairly consistent phlegm food input so you can do all this. Then it takes igniting, which requires either a nearby stove, obnoxious tinder drills, or expensive flint and steel (which eats roughly 5.4% of your iron outputs with optimal lime ratios). And all this results in ~180 silver of iron. A stamp press negates the need for some of the phlegm and some of the micro, but costs 5.8 iron bars itself, and the mine entrance alone costs 3.4 bars.
Assuming mining is worthwhile, what's the most efficient way to mine? How can I best reduce the labor intensiveness of it? Am I better off just killing crickets and buying what modest iron needs I have? Anything else I ought to know?
And further, crap, this means mounting a legit defense is going to be pricey. I figured iron would be easier to get once I had an infrastructure. Oh well.
This is all back-of-the-envelope, but 20 wood takes a little bit, turning it into coal requires you lead coal production pretty heavily. You need to then dig, chip, and haul some lime. You then burn, mine, and chip the ore. You also need fairly consistent phlegm food input so you can do all this. Then it takes igniting, which requires either a nearby stove, obnoxious tinder drills, or expensive flint and steel (which eats roughly 5.4% of your iron outputs with optimal lime ratios). And all this results in ~180 silver of iron. A stamp press negates the need for some of the phlegm and some of the micro, but costs 5.8 iron bars itself, and the mine entrance alone costs 3.4 bars.
Assuming mining is worthwhile, what's the most efficient way to mine? How can I best reduce the labor intensiveness of it? Am I better off just killing crickets and buying what modest iron needs I have? Anything else I ought to know?
And further, crap, this means mounting a legit defense is going to be pricey. I figured iron would be easier to get once I had an infrastructure. Oh well.