From our presentation after OJT at LCMco.

1. LEPANTO
CONSOLIDATED
MINING
COMPANY

2. HISTORY
1864 Sociedad Minero-Metallurgica Cantabro-Filipino de Mankayan
Septmeber 21, 1936 V. Lednicky & M. Arick copper plant 400 tpd to 1K tpd
(1939-1945 WW2) Mitsui Company 3 yrs
1947 4,500 tpd
1960’s Carlos Palanca Jr. Tubo Shaft, Roasting Plant
1980 FSE gold-rich porphyry copper deposit was discovered
1988 TSF 5-A, Nayak Shaft, Nayak Twin Decline, done pre-feasibility study FSE
September 1995 Victoria & Teresa gold ore deposit was discovered.
1996 cease production enargite: 743K t Cu, 92 t Au, 390 t Ag
November 1996-March 15, 1997 CIL, 10 mo’s 106K oz Au, 71K oz Ag
September 2012 FSGRI inferred mineral resource 19.8M oz Au, 9.921B lbs Cu
October 2015 Discovery of New Porphyry Copper-Gold Mineralization
May 12, 2016 EMS = ISO 14001:2004
June 2019 ISO 14001:2015

4. VISION & MISSION
To be a global Filipino mining company by attaining world-class capabilities and
becoming a corporate model in the fulfilment of social responsibilities.
We shall turn this vision into reality through the efforts of highly motivated, committed,
and competent employees who:
● continually explore and develop ore reserves
● optimize metal production through cost-efficient operations
● maintain outstanding safety records and ensure responsible env’l stewardship
● foster mutually beneficial partnership with host communities
● exhibit initiative and decisiveness
We in Lepanto are determined to enhance shareholders' investment through the
pursuit of excellence.

5. CORE VALUES
● Accountability
● Commitment
● Innovation
● Ownership
● Social responsibility
● Operational excellence

6. LOCATION
N
E

7. TOPOGRAPHY
Areas that are within the Enargite-QPG and
Teresa/Victoria orebody are the Barangay of
Poblacion, Sapid, Bulalacao, Palasaan and
portion of Tabio. Milling complex is in Sapid.
Mine camp, houses and offices are in Paco
Area. Tailings dam is in the northwest
surrounding barangay Paco, Cabitin and
Colalo.
Topography of barangay within the mining
area are relatively smooth with elevation from
1300 to 1500 masl. Required mining limit
shall be maintained in accordance to the
existing mining laws.

8. ORE RESERVE OF JAN 1, 2019
MINERAL RESOURCE AS OF JAN 1, 2019

9. Mine Access

11. Mine Ventilation

12. Ventilation Survey
Sling psychrometer is an instrument that
measures the relative humidity and dew point
in an area. A sling psychrometer has two
thermometers: a wet bulb and a dry bulb. The
wet bulb has a cotton wick over the bulb of the
thermometer, which is moistened with room
temperature water.
Vane anemometers are used for measuring
the velocity and volumetric flow rate, airspeed,
volume flow and temperature. Possible in
combination with a measuring cone. The
speed of the rotating vane of the anemometer
is converted into electric power, which is
transferred into air speed.

13. Prior to the calculation of the system
curve for each fan installation, an
inventory of all ventilation fans was done.
Included in the inventory are the fans’
size, motor rating, blade setting and its
fan curve and location. Considering which
fans are installed in bulkhead and with
ventilation tube.
A survey of the ventilation fans’ location,
the ventilation ductings connected to the
fans and a PQ survey was also done.
The resistance (R) for each fan shall then
be computed.
System Curve Calculation
Fan Installations

14. Atkinson Resistance
characterise the resistance to airflow of a duct
of irregular size and shape
& Square Law
pressure is proportional to quantity squared

15. Airflow Velocity Requirements
1. Air velocity in drives in which personnel travels should not
exceed 6 m/s.
2. Air velocity in a shaft in which personnel travels should not
exceed 10 m/s.
3. If the wet bulb temperature exceeds 25°C, an air velocity of not
less than 0.5 m/s must be provided.
4. A minimum air velocity of 0.25 m/s must be maintained in all
underground areas where vehicles or locomotives powered by
electricity are used.
5. A minimum air quantity of 0.05 m³/s per HP rated diesel power,
must be maintained in all underground areas where vehicles or
locomotives powered by diesel are used.
6. The optimum/ideal velocity for upcast raises excavated by
blasting is about 6 m/s.
7. The optimum/ideal velocity for upcast raises excavated by
raise bore machine is about 14.5 m/s.
Air Velocity Limits
Recommended Velocities

16. The airflow in any workplace
where a diesel unit operates
must not be less than 3.35
m³/s.
Typical airflow requirement
for diesel equipment in a
mine is 0.05 m³/s per kW.
BASIS OF REQUIRED AIRFLOW QUANTITY IN
VENTILATION PLANNING
• 75 CFM OR 0.04 CMS PER PERSON
• 100 CFM OR 0.05 CMS PER KW-DIESEL
• 0.40 ~0.50 CMS PER 1,000 TONS MINED PER YEAR

17. Secondary ventilation refers to the
provision of ventilation to
development ends, stopes and
services facilities, which constitute
secondary circuits tapped off the
primary circuit or main through flow of
air.
An unbalanced primary and
secondary combination can cause
re-circulation, which is inefficient and
potentially hazardous. These
inefficiencies extend into operational
and other considerations, such as
power.
Considerations in Secondary Ventilation
• As a general rule of thumb air quantity decreases
approximately 10% per 100 meters of
ventilation tubings.
• Ventilation tubings must be installed as straight as
possible.
• Sharp bends of ventilation bags must be avoided.
• Constrictions of any kind must be avoided.
• Leaks and tears must be repaired immediately.
• The correct size of ventilation tubings must be
installed.
• Distance of the last ventilation bag to the working face
must not be less than 15 meters.
• Distance of overlap fans (push and pull) must not be
less than 1.0 meter and pull fan
(exhaust fan) should be 25 meters or more from the
working face.

18. Ventilation Controls
The control of air
distribution should be
maintained by the use of
doors,stoppings, bulkheads
and regulators. These
should be constructed as
airtight as possible except
where controlled leakage is
desirable.

20. LeHfun2
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