The Amulsar Project is a highsulphidation epithermal deposit, but its close association with syn-depositional deformation adds a signature characteristic of orogenic gold systems. The deposit also has some characteristics of low temperature variants of IOCG deposits.

The Amulsar deposit is hosted in a thick pile of volcanogenic rocks thought to be related to the Tethyan magmatic arc/back-arc system. High-sulphidation epithermal deposits are associated normally with alteration grading from a central zone, dominated by silica-alunite alteration minerals, to an outer zone of argillic-kaolinite alteration mineral assemblages. At Amulsar, a similar sequence of alteration is observed, but the silica-alunite zone appears to be restricted to the mineralized vokanidastic and breccia rocks of the UV zone, and the argilic-kaolinite alteration is dominantly restricted to rocks of the LV zone. Both rock types are now strongly structurally interleaved, and mineralization is associated with subsequent deformation of this interleaved package.

The background alteration is characteristic of high.sulphidation epithermal systems, in which, fluids rich in magmatic volatiles cool and migrate to elevated crustal settings. The fluids arc commonly highly oxidized. Mineralization at Amulsar is associated with iron oxides. Iron sulphides have not been observed in significant quantities within the mineralized structures. The lack of micaceous alteration minerals associated with the gold mineralization indicates that fluid temperatures were likely less than 300'C, and within the range of temperatures associated with epithermal deposits. These oxidized fluids were injected into faults, fractures, and distant structures during an orogenic deformation that overprints the high¬sulphidation alteration. HOWever, the general absence of veining, and in particular, quartz veins, is atypical of most orogenic gold systems.

The Amulsar deposit was likely developed within a volcanic edifice with a protracted high-sulphidation fluid history that gradually developed into an epithermal level orogenic gold system that was perhaps still being fed by highly oxidized magmatic fluids.

Gold and silver mineralization at Amulsar is hosted predominately in UV rocks. Some mineralization occurs in LV rocks but usually in the vicinity of UV-LV contacts. The main gold mineralization is recognized as a hematite-gold event where mineralizing fluids deposited hematite, gold, probably silver, and traces of other metals. The hematite-gold event is thought to be a late event in the development of the Amulsar deposit.

Gold mineralization is controlled by the following features:
-Complex structural zones, particularly areas with variably oriented accommodation faults and
fractures that link them.
-Porous and permeable lithological units, including hydrothermal breccias, volcaniclastic breccias systems.
-Leached vuggy volcanics — allowing lateral migration of fluids away from structurally controlledconduits.

Silver mineralization is present at the Amulsar Project, but the genesis and distribution is not well understood. Silver mineralization does not correlate with gold mineralization. Average silver grades range from 2 g/t to 5 g/t and locally can occur in the 100 g/t to 200 g/t range.

The Amulsar deposit will be developed by open pit mining using a 10m bench height, 22 cubic meter front shovels, and 180 tonne trucks with a capacity to carry 190 tonnes of material. Many configurations of truck and shovel sizes were considered, but this was a good configuration as far as equipment utilization and truck & shovel match. It should be noted that an additional drilling phase is planned prior to ordering mine equipment. Additional mining equipment requirement studies should continue after planned drilling has been completed and a new grade model has been prepared.

The Amulsar processing facility will receive ROM ore by haul trucks at a nominal rate of 10.5 Mtpa or 28,767 tonnes per day.

The processing facility will consist of two-stage crushing, screening and overland conveying to the fine ore stockpile and truck loadout bin. From there, the 19 mm crushed ore will be transported via trucks to the leach pad for heap leaching. Pregnant leach solution (PLS) from the heap will be treated in a CIC circuit. Gold will be recovered by an adsorption-desorption-recovery (ADR) circuit where the final product will be dore.

Amulsar processing facility consists of the following unit operations:
-Primary Crushing
-Screening Facility
-Secondary Crushing
-Overland Conveying
-Crushed Ore Stockpile
-Heap Leach Facility
-Carbon-In-Leach
-Carbon Adsorption, Desorption and Recovery
-Carbon Handling
-Refining
-Reagents
-Utility Facilities

Ore is processed through two stages of crushing to a target crush size of 86 percent passing 18 mm (P94 = 19 mm). The crusher unit operations include a primary jaw crusher, and secondary cone crushing in closed circuit with triple deck multi slope screens. The crushed ore storage bin, secondary crushing feed bin, and crushed ore stockpile provide crushing surge capacity for the facility.

The heap leach process consists of stacking crushed ore on the leach pad in lifts and leaching each individual lift to extract the gold and silver. Barren Leach Solution (BLS) containing dilute sodium cyanide will be applied to the ore heap surface using a combination of drip emitters and sprinklers at a design application rate of 6 L/hr/m2. The design leaching cycle of the ore heap is 60 days.

The solution will percolate through the ore to the drainage system above the pad liner, where it will be collected in a network of perforated drain pipes embedded within a 0.6-m minimum thickness granular cover drain fill layer above the liner. The solution will gravity flow to the process pond. PLS collected in the process pond will be pumped to the process plant to extract the gold and silver.

The process plant consists of an Adsorption, Desorption, Recovery (ADR) plant, refining, and reagent makeup and delivery systems. The ADR plant will be located to the southeast of the HLF collection ponds, and the plant area will be lined to contain spills and any overflow from the plant will be routed to the process pond.

The plant extracts precious metals from the PLS onto activated coconut carbon. The ADR circuit adorbs metals from the PLS in carbon columns and moves the carbon from the columns into strip vessel where the metal is eluted into solution at higher tenors. This new PLS is treated with zinc which causes gold and silver to precipitate from solution. Once the precious metals are precipitated, the solution is filtered and the cake is dried, mixed with flux and smelted to produce dore bars. The dore bars are then shipped to a refinery for further refining. The ADR circuit also regenerates the carbon through acid washing and a regeneration kiln to maintain the carbon's ability to adsorb metals in the carbon columns. Once regenerated the carbon is returned as fresh carbon to the carbon columns.