The Rockies area is a pretty big space and ground conditions vary immensely so any guess on settings is just that , a guess. If as you assume the ground is highly ionized and arid , depth will not be an issue as you won't be going deep or be able to dig if you did get a deep signal. I have dug early 1900's wheats in soil like that which has never been disturbed , usually about 3 or 4". Therefore , run your silencer where your machine is comfortable , -1 won't get you anything but audio fatigue.
If it's wet , all bets are off , and the soil moisture could change from saturated to 3% in 10' going up a slope.
If there is modern trash present the better question is going to be what you are going to dig with , especially with the Deus as you will be digging early and often , but that should apply regardless of what detector you are using in a site like this. A long handled pick with a magnet like a 30" Badger will be your best friend:thumbup:
If it's wet , all bets are off , and the soil moisture could change from saturated to 3% in 10' going up a slope.
If there is modern trash present the better question is going to be what you are going to dig with , especially with the Deus as you will be digging early and often , but that should apply regardless of what detector you are using in a site like this. A long handled pick with a magnet like a 30" Badger will be your best friend:thumbup: