trap yourself in your own field? whoops.
MFFS multi-tool on field teleporter may get you through.
or you can make yourself an access card that lets the system let you teleport, assuming you have the defense station inside.
@ above: for the most part, fortune 3 gives more drops per ore, grinder gives byproducts.
remember, to get the diamonds from dust, you need the implosion compressor, which is rather lossy.
to the second part, it depends if your main pick is silk touch or fortune.
i reccomend silk touch, as some ores like iridium are NOT affected by fortune.
also saves inventory space.
in this case its better to fortune the ores as you need materials.