MARMAR & MEXUS

SANTA ELENA PROJECT

AUGUST 5 TH, 2017

H. CABORCA, SONORA, MEXICO.

Volumetry (Patio)

AREA TONS MONTH

A1 5,280 JULY

BEFORE JULY

16,230 ----------

CLOSE OF MONTH

21,510

AUGUST(1-5 )

2,170

TOTAL 23,680

This month (July) was moved 5,280 tons to the Patio and the first days of August 2,170 tons.

Total of Mineral 23,680 tons.

MARMAR & MEXUS

MARMAR & MEXUS

MARMAR & MEXUS

The projection for this month (August) is to move 15,000 tons to complete the patio (38,000 tons aprox)

With 6 meters high. The ramp will be out of the patio.

MARMAR & MEXUS

MARMAR & MEXUS

OPERATIONS

On 14 July a problem was detected in the Merrill Crowe process with the initial reading flowmeter 3,426.6

m3 with an irregular operation for problems generated in stage clarifiction process and filter press caused

by excess of Clay on pregnant solution, so, this comming from the leaching pad. 1,685.8m3 were processed

( 14 to 23 July).

As a result of this process was obtained an Irregular precipitation with earth, diatomacea and cellulose

contamination (32 kg of precipitate).

As a part of the operational decisions it was implemented a new process with activated Charcoal. The

Activated Charcoal Column System (ADR) was implemented on 24th July and between July 24th and 29th was

implemented a system of filtration of rich solution in order to avoid saturation in the Charcoal, taking tests and the

results were that the clay is not cause any Problem to the Charcoal.

MARMAR & MEXUS

OPERATION (START UP)

On July 30th the operation was checking with different flows in order to assure do not have any problema with

the columns and and finally we are operating with 4 m3 /Hr. Also, it was placed mesh in the discharge of the columns

to avoid the loss of the Charcoal, and the next day the operation was estabilized.

OPERATION (START UP CONDITIONS)

• Pregnant Solution (pond) 1,288 m3

• Cyanide 800 PPM

• PH 11

• Barren 500m3

• Cyanide 700 PPM

• PH 11

• 3 Activated Charcoal Column System (ADR)

• 300 kg activated Charcoal Column each one( total 900kg)

• Flow 4 m3 /hr

• Assays of head and tail

MARMAR & MEXUS

MARMAR & MEXUS

NEXT STEPS

* Will be increased more Activated Charcoal Columns and implemented a system of filtration in order to

increase the flow from 4 m3 / hr to 20 m3 / hr .

* The irrigation process will be reactivated includes the extension of the leaching pad

* Complete the 38,000 tons carrying material from Julio to the leaching pad assuring high values

* Build and implement the electrolysis process (working on that)

• Will be evaluated if the Merrill Crowe process can be reactivated in parallel or just Works with

Activated Charcoal Column System (ADR)

* Will be installed a filter between the leaching pad and pregnant pond in order to avoid Clay on pregnant

solution and saturation in the Charcoal