Current Resources

Alto’s existing Mineral Resource base is shown in Table 1 below

Table 1: Sandstone Gold Project Mineral Resource (JORC 2012) Estimate as at 27th May 2020

Deposit	Category	Cut-off (g/t Au)	Tonnage (kt)	Grade (g/t Au)	Contained Gold (oz)
Lord Henry4	Indicated	0.8	1,200	1.6	65,000
TOTAL INDICATED			1,200	1.6	65,000
Lord Henry4	Inferred	0.8	110	1.3	4,000
Lord Nelson1	Inferred	0.8	1820	1.9	109,000
Indomitable Camp + Vanguard Camp3	Inferred	0.3-0.5	2,580	1.5	124,000
Havilah & Ladybird2	Inferred	0.5	510	1.8	29,000
TOTAL INFERRED			5,020	1.7	266,000
TOTAL INDICATED & INFERRED			6,220	1.7	331,000

Small discrepancies may occur due to rounding

Note 1. AME ASX release 27 May 2020 "Alto Increases Lord Nelson Resource By 60% To 109,000 Ounces At 1.9 G/T Gold”
Note 2. AME ASX release 11 June 2019. “Alto increases Total Mineral Resource Estimate to 290,000oz, Sandstone Gold Project”
Note 3. AME ASX Release 25 Sept 2018. “Maiden Gold Resource at Indomitable & Vanguard Camps, Sandstone WA”
Note 4. AME ASX Release 16 May 2017. “Maiden Lord Henry JORC 2012 Mineral Resource of 69,000oz.”

All material assumptions and technical parameters underpinning the 2017, 2018, 2019 and 2020 JORC (2012) Mineral Resource estimates in the above ASX announcements continue to apply and have not materially changed since last reported.