The deposits and prospects found within the Project area are considered to be examples of porphyry-style deposits, in particular gold-rich porphyries.

Tectonic setting, geological environment, intrusive rocks, alteration assemblages and mineralization of the Arizaro and Lindero deposits display the characteristics of gold-rich porphyry copper deposits as described by Sillitoe (2000).

Overall, the Arizaro deposit as currently defined is roughly circular in plan view, extending 650 m north-south and 600 m east-west. The gold-copper mineralization is associated with strong potassic alteration with a surrounding zone of propylitic alteration. The higher-grade core of the deposit, with gold grades averaging 0.6 g/t gold, is characterized by magnetite- and biotite-rich breccias. Surrounding the mineralized breccias, gold grades average 0.2 g/t gold. Copper grades are more consistent across the deposit averaging 0.15% copper. Thin veins (<5cm wide) of quartz-magnetite, quartz, quartz-sulfide, biotite-chalcopyrite, and late-stage anhydrite-sulfide, along with chalcopyrite-magnetite disseminations, occur within the breccias. In some areas, the vein density is high, forming vein stockworks. Chalcopyrite and bornite are the main copper minerals with copper oxides, primarily chrysocolla and brochanthite, occurring within the upper 50m to 100m. Gold is primarily associated with chalcopyrite, quartz, and anhydrite veinlets. Coarse gold does occur and was identified macroscopically in an anhydrite-chalcopyrite-molybdenite vein. Magnetite is common as massive replacements of the matrix in breccias, in veinlets and as disseminations.

The mineralized zones at the Lindero deposit form a semi-circular shape about 600 m in diameter which extends to a depth of 600 m, consisting of four different zones at the surface. Distribution of the gold–copper mineralization at Lindero shows a strong relationship to lithology, stockwork veinlets, and alteration assemblages. Gold values average 0.70 g/t and copper values are typically about 0.11%. Higher grades of gold–copper (approximately 1 g/t Au and 0.1% Cu) are commonly associated with sigmoidal quartz, quartz–magnetite–sulfides, biotite-magnetite– chalcopyrite, magnetite–chalcopyrite and quartz–limonite–hematite stockworks which are strongly associated with K-feldspar alteration. This association is very common in the east zone of the deposit, where the highest gold grades occur. At other locations where one or more stockwork types are missing or the intensity of fracturing is lower, mineralization tends to be weaker and the grades of gold tends to be lower (approximately 0.4 g/t Au).

Mining Methods
The Lindero Deposit is suitable for open pit mining methods. Gold grade distribution and the results of the mineral processing testing indicate that ore from Lindero can be processed by conventional heap leaching methods.

The Lindero Project has been planned as an open pit truck and wheel loader operation. The truck and wheel loader method provide reasonable cost benefits and selectivity for this type of deposit. Only open pit mining methods are considered for mining at Lindero.

Pit designs
Detailed pit design was completed, including an ultimate pit and five internal phased pits. The ultimate pit was designed to allow mining of mill feed material identified by NPVS optimization while providing safe access for people and equipment. Internal pits or phases within the ultimate pits were designed to enhance the Project economics by providing higher-value material to the leach pad earlier in the mine life

Bench height
Pit designs were developed based on 8 m benches for mining. This corresponds to the resource model block heights, and Fortuna believes this to be reasonable with respect to dilution and equipment anticipated to be used in mining.

Feb. 20, 2019
All mine equipment required for the start of operations has arrived and has been assembled on site including; six 100 ton trucks, two 17 cubic yard wheel loaders, one 5 cubic yard crawler excavator, two 449 HP dozers, two 250 HP motor graders,­­ and two 800 HP rotary blast hole drill rigs.

Crushing
Run-of-mill (ROM) ore will be transported from the mine in 91-tonne surface haul trucks and dumped in a 200-tonne capacity ROM feed bin.

Material will be fed from the ROM feed bin to a 1.2 m x 7.9 m apron feeder and then to a grizzly feeder with 150 mm openings. The grizzly oversize will be fed to a 1500 mm x 1300 mm jaw crusher and the grizzly undersize will be recombined with the jaw crusher product on the primary crusher discharge conveyor which will feed a 175-t secondary crushing distribution bin. A tramp metal electromagnet and metal detector will be installed on the primary crusher discharge conveyor to protect the secondary crushers.

Ore from the distribution bin will be fed equally to three 1.8 m x 6.1 m secondary double deck screens by belt feeders. Screen over-size will report to a 300 kW cone crusher. Three screens/cone crushers in parallel are planned. The cones will be run in closed-circuit with the screens.

Stockpiled material will be reclaimed using vibrating feeders underneath the pile, which will feed a conveyor and then into a 140-t tertiary crusher surge bin. Discharge from the surge bin will be transported to the feed chute immediately above the HPGR. A tramp metal electromagnet and metal detector will be installed on the feed belt immediately before the HPGR chute to protect the HPGR from tramp metal.

The HPGR is a Weir-KHD Model RPS 16-170/180 with 1.7 m diameter by 1.8 m wide rolls, and was purchased by Goldrock. The edge material which represents roughly 25 % of the total product will be recycled back to the HPGR feed bin. The final plant product from the HPGR will be nominally 80 % passing 6 mm. The center product will be fed to the flake breaker.

Run-of-mill (ROM) ore will be transported from the mine in 91-tonne surface haul trucks and dumped in a 200-tonne capacity ROM feed bin.

Observation shows that HPGR crushing will generate flakes when treating the Lindero ore. These flakes will be sufficiently durable that they will survive the agglomerating drum and will pass unagglomerated to the heap. In order to break these flakes, a Gundlach continuous tooth roll crusher will be placed in the circuit. The roll crusher will contain two opposing inter-meshed timed rolls with a 25 mm gap. A fixed scalping screen will divert any non-flaked material around the crusher. The product of the de-flaking crusher will report to the agglomeration surge bin.

The agglomeration circuit is designed to mix concentrated cyanide and cement with the HPGR- crushed ore, and adhere the fine particles to the coarse rock by tumbling the mixture in a rotating drum.

Agglomerated ore stacking will be undertaken using c ........