I am going to give one tip away for you guys

in less then half and hour I was able to come up with all this:
Coal-3,3,15,18,13,32,3,21,21,4=133
Iron-1,5,2,4,6,2,7=27
Gold-8,6,5=19
Lapis-0
Redstone-2,2,4,9,3=20
diamond-5,3,1=9
all together that equals:
208 ores in less then half an hour
so here is the tip.when digging make a stair way all the way to bed rock(this for me was made long before and i just went down it seeing if i could do some branches) once you finish your stair way make your way to lever 13 and dig a branch there and both side of the stairs..after a while you will start to notice dirt and gravel..dig that up..all of it..and sooner or later you will start to see some iron and coal, and many other things
For me, I cleared 5ish spots of dirt and gravel and I found 3 new cave systems, and all that ore! so why not trying it out!