You can try what I call Pro-Gold, based on the Prospecting program. Settings:
Target Volume 48 [User preference]
Audio Threshold 17 [User preference]
Tone (Audio Freq) 160
Audio Discrim ON
Silent Search OFF
Mixed Mode OFF
A.C. Sensitivity 68 [SET FOR STABLE OPERATION]
D.C. Sensitivity 50 [SET FOR STABLE OPERATION]
Backlight OFF
Viewing Angle 25
Pro Options: Audio
Ratchet Pin-pointing OFF
S.A.T Speed 9
Tone I.D ON
V.C.O ON
Modulation OFF
G.E.B /Trac
Autotrac ON
Trac View OFF/ON (personal preference)
Autotrac Speed 8
Autotrac Offset +1
Trac Inhibit OFF
Coarse G.E.B AUTO
Fine G.E.B AUTO
Descrim Edit
Accept: -40-+95
Reject:-95--41
Block Edit AS EDIT
Learn Accept OFF
Learn Reject OFF
Recovery Speed 20
Bottlecap Reject 1
Hot Rock Reject 10 [If you've got problems with hot rocks turn it up]
Sweep Speed 7
Ground Filtering 4 [Depends on trash and mineralization]
Display
Visual Disc ON
Icons OFF
V.D.I Sensitivity 85
D.C Phase ON
Graph Averaging ON
Graph Accumulating ON
Fade Rate 7
Single Transmit Receive
Preamp Gain 4 [SET FOR STABLE OPERATION]
2 Frequency (best data) OFF
2 Frequency (correlate) OFF
V.D.I Normalized ON
1 Frequency (3 khz) OFF
1 Frequency (15 khz) ON