Introduction

Dateline Resources announced an updated gold Mineral Resource Estimate for Colosseum on 6 June 2024. The Company engaged H&S Consultants Pty Ltd (HSC) to update the Mineral Resource Estimate (MRE) for the Colosseum gold deposit.

The Mineral Resource Estimate has not been updated since 6 June 2024 and remains unchanged as at 30 June 2025.

Recoverable Multiple Indicator Kriging (MIK) was used to complete the gold grade estimation using HSC’s in-house GS3M modelling software. The geological interpretation, such as it is, block model creation and validation were completed using the Surpac mining software. HSC considers MIK to be an appropriate estimation technique for the type of mineralisation and extent of data available.

Grade Tonnage Curve for the June 2024 MRE
Table 2: Colosseum Mineral Resource Estimate (at 0.5g/t Au cut-off, as at 30 June 2025)

Category

Cut-off (g/t Au)

Metric Tonnes

Grade (g/t Au)

Contained Gold (Ounces)

Percentage

South Pit

Measured

0.5

2,670,000

2.23

191,200

Indicated

0.5

3,000,000

1.28

123,800

Inferred

0.5

5,010,000

1.13

182,600

TOTAL

0.5

10,680,000

1.45

497,600

North Pit

Measured

0.5

6,930,000

1.18

263,800

Indicated

0.5

4,220,000

1.16

157,700

Inferred

0.5

5,260,000

1.07

182,000

TOTAL

0.5

16,420,000

1.14

603,400

Combined

Measured

0.5

9,600,000

1.47

455,000

41%

Indicated

0.5

7,200,000

1.21

281,400

26%

Inferred

0.5

10,300,000

1.10

364,000

33%

TOTAL

0.5

27,100,000

1.26

1,100,400

100%

Notes:

  • Mineral Resource estimated at 0.5g/t Au cut-off
  • Numbers may not add up due to rounding.
  • Differences occur when converting from Imperial to Metric units are less than 1%
  • Further information in ASX announcement dated 6 June 2024

The updated MRE represents a 35%, or 288koz, increase in the total MRE since it was first reported on 6 July 2022. Importantly, the Measured component of the MRE has increased by 77% in ounces to 455koz and 23% in grade to 1.47g/t Au.