Slate shovels, and shovels at quality 3000 provide 1 dig per attempt. Shovels at q9000 provide 2 digs per attempt, and shovels at q9999 provide 3 digs per attempt. The performance of intermediate or lesser shovels is random, with chances of giving the higher or lower amount varying with quality. This means 4 people with q9999 shovels can have a successful dig.
Endurance foods speed you up, allowing even less people at the dig for minimum results (or more productive digs with the same number of people :))
Both cuttable stones and medium stones are produced at a digging site. Early estimates put the ratio of cuttable stone to medium stones at somewhere around 10:1 (or maybe 8:1). Later estimates, with fish and better quality shovels, are showing 5:1. This may be because medium stones come "deeper", and with more people and better shovels we are able to keep the holes "deeper" allowing us more medium stones. No other resources have been produced by a dig at this time.
After arriving at the dig site, the leader will often designate a "picker" or two, to retrieve the stones for dispersal later. Typically, as a digger, you will asked to move a few steps away from the dig site so as to allow the pickers easier access. Just click on the dig site, and a "Dig deeper [D]" menu will appear. Pinning it is a good strategy, as you will likely be clicking that button a lot in the next hour or two. Digging sets an Endurance timer, so you will have to wait before you can dig again. Don't be shy about talking and be sure to check for people needing their Leadership petitions signed or acrobatics worked. Remember: it's a game and even clicking on a dirt hole can be fun!
If you end up staying until the end, be sure to thank the organizer and pickers: those tend to be frantic and tedious jobs. Watch the main channel, there might be another event starting up to take advantage of the energy of the group. Work on those Acrobat Facets!
If some of the stones are to be distributed to the diggers, the leader will announce how many, what kind and what the distribution scheme is. They will likely call off names and then begin handing out the stones. If you get a stone or two, thank the leader and then move a bit out of range - this allows the distributor to see the people still in need of stones more easily. If, on the other hand, the dig was for research donations at your local University, pat yourself on the back as well for a job well done. Thanks to you, we are that much closer to a perfect society!
With a perfect shovel and grilled fish, as little as 3 people can successfully dig for stones. This puts stones within reach of even very small groups of trusted people. There are some things that will help:
Are we sure digging at max size gives at most 1 stone? I thought I've seen 3 stones show up when I dug with a q9999... ?
(Tamutnefret) Out of hundreds of dig actions, I've never seen more than 1 stone from a single person's dig action even with quality 9999 shovels. Lag can often cause the appearance of a stone and a person's dig action to be separated by a few seconds.
Using these guides, a group of 4 people with a 9999 shovel and grilled fish were able to dig up a stone every 8 seconds. Without taking turns and allowing the hole to shrink, they got half that rate and even slower when someone forgot to eat. A group of 3 should be able to get 1 stone every 32 seconds, which is very slow but a lot better than nothing.
With 9k shovels, 5 people should be able to get 1 stone per 16 seconds. 6 people should be able to dig up 1 per 8 seconds, and 7 people should get about 1 per 5-6 seconds.
With a 9999 Shovel and End food of about 28 or higher solo digs are doable. Could probably do a solo with less End, say 24 minimum but getting stones takes alot longer.
from ATitD forums - author Tamutnefret