Summary of trench program
Trenching to date has comprised 115 trenches for 3974m (Table 1). This includes a combination of hand dug and mechanically excavated trenches with lengths that range from 9m to 93m.
Trenches were designed to test to main target types:
First-ordergold geochemical anomalies in composite rock chip samples that were initially collected on a nominal 20m by 40m sample grid (see ASX announcement, Rio Negro - Target 38 Sampling Results, 8 July 2021).
Outcropping vein structures and their covered extensions as prime geological targets with gold mineralisation undetected by the composite rock chip samples
A summary of trench results is shown below in Table 2.
In a general sense, the best mineralised structures defined in trenches coincide with the highest anomalies in the composite rock samples, confirming the methods effectiveness in vectoring to blind veins that do not outcrop.
Summary of drill targets
Priority 1 drill targets: Four mineralised structures for 900m cumulative strike
Four vein structures have returned >10 gram-meters Grade Thickness (GT) trench intercepts and are prioritised for drill testing on sections spaced 75m apart (GT is calculated as gold grade x thickness).
West-northwest trending mineralised structure outcropping over 100m strike, open to the east- southeast and west-northwest under shallow gravel cover
ROT-004: 25m at 2.9gpt Au (72 GT)
ROT-023: 10.7m at 3.7gpt Au (39 GT)
ROT-024: 1.9m at 184gpt Au, 55gpt Ag (350 GT)
Northwest trending mineralised structure outcropping over 200m strike, open to the east-southeast under shallow gravel cover
ROT-009: 1m at 279gpt Au, 116gpt Ag (279 GT)
West-northwest trending mineralised structure outcropping over 200m strike, open to the east- southeast under shallow gravel cover
ROT-042: 7m at 3.6gpt Au (25 GT)