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Titlecompetent person's report minto mine
LanguageEnglish
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Total Pages180
Table of Contents
                            1. Executive Summary
		1.1 Property Description and Location
		1.2 History
			Mineral resources have been estimated in conformity with generally accepted Canadian Institute of Mining, Metallurgy and Petroleum (CIM) “Estimation of Mineral Resource and Mineral Reserves Best Practices” guidelines and are reported in accordance wit...
			1.2.2 Co-operation Agreement with the Selkirk First Nation
		1.3 Geological Setting and Mineralization
			1.3.1 Geological Setting
			1.3.2 Mineralization
		1.4 Deposit Types
		1.5 Mineral Resources and Reserves
			1.5.1 Mineral Resources
			1.5.2 Mineral Reserves
		1.6 Mine Engineering and Infrastructure
			1.6.1. Orebody Geometry
		1.7 Mineral Processing
		1.8 Environmental Studies, Permitting and Social and Community Impacts
			1.8.1. Current Licences
				Type A Water Use Licence
				Type B Water Use Licence
				Yukon Quartz Mining Licence
			1.8.2 2017 Reclamation and Closure Plan
			1.8.3 First Nation Consultation and Community Engagement
		1.9 Discussion and Conclusions
	2. Introduction
		2.1 Terms of Reference
		2.2 Terms, Definitions and Units
		2.3 Sources of Information
		2.4 Involvement of Competent Person
	3. Reliance on Other Experts
	4. Property Description and Location
		4.1 Description and Location
			4.1.1 Minto block
			4.1.2 DEL Block
			4.1.3 BOND Block
			4.1.4 MEL Block
		4.2 Co-Operation Agreement with the Selkirk First Nation
	5. Accessibility, Climate, Local Resources, Infrastructure and Physiography
	6. History
		6.1 Exploration History
			6.1.1 History of BOND, MEL and DEL blocks
		6.2 Minto Production History
			6.2.1 Precious Metals Purchase Agreement, Silverstone Resources Corporation
	7. Geological Setting and Mineralization
		7.1 Regional Geology
		7.2 Property Geology
			7.2.1 Property Geology
			7.2.2 Structure
		7.3 Mineralization
			7.3.1 Mineralization
			7.3.2 Alteration, Weathering and Oxidation
		7.4 Additional Exploration Targets (as of January, 2012)
			7.4.1 Fireweed Target
			7.4.2 Inferno Target
			7.4.3 MSD Gap target
		7.5 Property Geology, BOND, MEL and DEL Blocks
			7.5.1 BOND property
			7.5.2 MEL Property
			7.5.3 DEL Property
	8. Deposit Types
	9. Mineral Resource and Reserve Estimation
		9.1 Mineral Resources
			9.1.1 Introduction
			9.1.2 Mineral Resource Block Models
			9.1.3 Resource Database
			9.1.4 Geology, Mineralized Zone and Domain Solids
			9.1.5 Mineral Resource Block Model Parameters and Methods
			MSD – Copper Keel
			9.1.6 Resource Classification
			9.1.7 Mineral Resource Reporting
			9.1.8 Competent Person Statement
		9.2 Mineral Reserves
			9.2.1 Mineral Reserves Model
		9.3 Reconciliation of Mineral Resource Block Model
			9.3.1 Block-Model-to-Mine Reconciliation: Area 2 – Stage 3 Open Pit
			9.3.2 Block-Model-to-Mine Reconciliation: Area 2 Underground
			9.3.3 Total Block-Model-to-Mill Reconciliation
	10. Mine Engineering and Infrastructure
		10.1 Introduction
			10.1.1 Background
		10.2 Operations Overview
			10.2.1 M-Zone Underground (completed)
			10.2.2 Area 118 Underground (completed)
			10.2.3 Area 2 Underground (in progress)
			10.2.4 Minto East Underground (in progress)
			10.2.5 Copper Keel Underground
			10.2.6 Minto East 2 Underground
			10.2.7 Minto North Underground
			10.2.8 Ore Production and Underground Scheduling
		10.3 Underground Mine Development and Design
			10.3.1 Mining Method
			10.3.2 Access
			10.3.3 Stope Layout
		10.4 Underground Mine Operation
			10.4.1 Material Handling
		10.5 Geotechnical Assessment
			10.5.1 Orebody Geometry
			10.5.2 Hydrogeological Assessment
			10.5.3 Excavation Dimensions
			10.5.4 Rock Mass Characterization
			10.5.5 Stability Analyses
			10.5.6 Ground Support Requirements
			10.5.7 Monitoring
		10.6 Ventilation, Ancillary Infrastructure, and Dewatering
			10.6.1 Infrastructure
			10.6.2 Ventilation Circuit
			10.6.3 Compressed Air
			10.6.4 Underground Electrical Power
			10.6.5 Water
				10.6.5.2. Dewatering
				10.6.5.3 Mine Water Quality and Inflow Monitoring
				10.6.5.4 Communications
				10.6.5.5 Blasting Procedure and Infrastructure
			10.6.6 Explosive Storage and Handling
			10.6.7 Fuel Storage and Distribution
		10.7 Mine Safety
			10.7.1 General Mine Safety
			10.7.2 Emergency Response
			10.7.3 Fire Suppression
			10.7.4 Industrial Hygiene and Fatigue Management Programs
			10.7.5 First Line Supervisory Training
			10.7.6 Diesel Equipment
			10.7.7 Shotcrete
			10.7.8 YWCHSB Reporting
		10.8 Open Pit Mining
			10.8.1 Ore Quantities
			10.8.2 Slope Stability and Geotechnical Assessments
		10.9 Design and Construction
			10.9.1 Site Preparation
			10.9.2 Construction QA/QC
			10.9.3 Stability Analyses
			10.9.4 Construction Schedule
			10.9.5 Material Release Schedule
			10.9.6 Ore Handling Procedures
		10.10 Associated Mine Services and Infrastructure
			10.10.1 Ancillary Infrastructure
			10.10.2 Waste Management
				10.10.2.1 Overburden Management
			10.10.2.2 Waste Rock Management
			10.10.3 Tailing Management
			10.10.4 Industrial Complex
			10.10.5 Fuel Storage
		10.11 Mine Design and Methods
			10.11.1 Volume
			10.11.2 Access
			10.11.3 Wall Design and Overburden Stability
			10.11.4 Ground Movement Monitoring
			10.11.5 Blasting and Wall Control
			10.11.6 Explosives
			10.11.7 Typical Wall Design Parameters
			10.11.8 Haul Roads
		13
	11. Mineral Processing
		11.1 Crushing
		11.2 Grinding
		11.3 Flotation
		11.4 Precious Metals
		11.5 Reagents and Services
		11.6 Process Control
		11.7 Laboratories
		11.8 Mill Operations
	12. Environmental Studies, Permitting and Social and Community Impacts
		12.1 Environmental Assessment and Licensing
			12.1.1 Current Licences
				Type A Water Use Licence
				Type B Water Use Licence
				Yukon Quartz Mining Licence
			12.1.2 Regulatory Requirements
		12.2 Stop Work Order, Area 2 and Minto East
	13. Reclamation and Closure Planning
		13.1 History
		13.2 2017 Reclamation and Closure Plan
			13.2.1 Areas of Material Non-Compliance
			13.2.2 Facilities of Material Significance
			13.2.3 Mine Camp and Related Infrastructure
			13.2.4 Mill Buildings and Related Infrastructure
			13.2.5 Fuel Farm Area
			13.2.6 Sewage Treatment Plant
			13.2.7 Water Treatment Plant
			13.2.8 Explosives Plant Site
			13.2.9 Mobile Equipment
		13.3 First Nation Consultation and Community Engagement
			13.3.1 Engagement with Selkirk First Nation
			13.3.2 Tri-Partite Socio-economic Working Group
			13.3.3 Tri-Partite Reclamation and Closure Working Group
			13.3.4 Other Stakeholders
		13.4 Special Factors
	14. Discussion and Conclusions
		14.1 Discussion
		14.2 Conclusion
	15. References
                        
Document Text Contents
Page 1

COMPETENT PERSON’S REPORT
MINTO MINE – YUKON TERRITORY, CANADA

62°37’05” N, 137°14’56” W, Whitehorse Mining District























Prepared for:
PEMBRIDGE RESOURCES PLC.




Prepared by:









T-4

Page 2

COMPETENT PERSON’S REPORT
MINTO MINE – YUKON TERRITORY, CANADA

Whitehorse Mining District, Yukon Territory, Canada
NTS: 115I11


62°37’05” N, 137°14’56” W

UTM (NAD 83): 384625, 6945045, Zone 8














Effective Date, Jan 31, 2018



Prepared for:
PEMBRIDGE RESOURCES PLC.

180 Piccadilly
London, United Kingdom W1J 9HF


Prepared by:

AURORA GEOSCIENCES LTD
34A Laberge Rd.

Whitehorse, Yukon Y1A 5T6



Supervised By:
Carl Schulze, B.Sc., P.Geo., (CP)




T-5

Page 90

Pembridge Resources plc. Aurora Geosciences Ltd.


Minto Property Competent Person’s Report 88 | P a g e

A solid model of the 100, 300, 500, 700, 800 and 900 ore zones within the Minto East 2 deposit and a
single ore zone within the Minto North 2 deposit was created from sections.

Every intersection was inspected, and the solids were then manually adjusted to match exactly the
interval intercepts. Once the solids models were created, they were used to code the drill hole assays
and composites for subsequent geostatistical analysis. For the purpose of the resource model, the solid
zone was utilized to constrain the block model by matching assays to those within the zones in a process
called geologic matching so that only composites that lie within a particular zone are used to only
interpolate the blocks within that zone. The orientation and ranges (distances) utilized for search
ellipsoids used in the estimation process were derived from the strike and dip of the mineralized zone,
site knowledge and on-site observations by Minto’s geological staff.

9.1.5 Mineral Resource Block Model Parameters and Methods
The block models and the estimation plan for each deposit were unique and varied depending upon
specific geological and mineralization characteristics, grade distributions, location and orientation. In
addition, as the deposits were estimated by a number of different qualified professionals, there
invariably will be a degree of subjectivity to the methods and procedures employed. However, it is the
opinion of the Competent Person that all methods, procedures and results adhere to CIM Best Practices
for Mineral Resource and Mineral Reserve Estimation and that the work was performed using accepted
industry standards and quality. In all cases the following steps were employed:

• Mineralized zone code and percentage of modelled mineralization in each block;

• Estimated bulk specific gravity based on an inverse distance squared method;

• A cutting or grade limiting strategy was developed and employed in order to address outlier
grades;

• Estimated block Cu, Au, and Ag grades by kriging or inverse distance to the second power,
using one or more estimation passes for the mineralized zone.



Table 27 details the parameters and methods employed for each of the current models for each of the
deposits.

Page 91

Pembridge Resources plc. Aurora Geosciences Ltd.


Minto Property Competent Person’s Report 89 | P a g e

Table 27: Summary of Block Model Parameters and Methods



MSD – Copper Keel
There are three individual block models for MSD and Copper Keel, named the MSD2011, MSD2015 and
CuKeel March 2017. Wayne Barnett of SRK also authored the MSD2011 and MSD2015 resource models
and estimates with effective dates September 13, 2011 and May 31, 2015, respectively. Copper Keel was
initially modelled and estimated in December 2016 and subsequently updated in March 2017.

The resource estimate for the Copper Keel Lens was updated, for potential underground development in
the upper (“O”) and lower (“P”) lenses. The block model was updated using the updated geological
solids provided by Minto Geology. Grades were re-estimated using similar parameters used in the June
2015 iteration.

Outlier restriction varies by model with MSD2011 being uncapped; however, it employs a search
restriction for outliers for Cu, Ag and Au. The MSD2015 was capped within each domain for each of
copper, gold and silver. For the Copper Keel deposit, the grade restriction strategy was employed by
area where copper, silver and gold grades where capped to 9%, 5%, 4.5%; 38gpt, 30gpt, 30gpt; 6gpt,
2.8gpt, 4gpt for the Main, West and North areas, respectively.

All block models use a 10m E X 10m N X 3m L block size and 1.5m composite length. The interpolation
methods used for the MSD2011, MSD2015model and CuKeel Mar-2017 were ordinary kriging for Cu, Au
grades, and Inverse Distance Squared for Ag grades.

Data
MSD Ridgetop Minto North Minto East Minto East 2

Minto North 2
(formerly Inferno

North)
Composite
length (m) 1.5 1.5 1.5 3 1.5 1.5

Capping
limit (Cu %)

MSD2011 uncapped; search
restriction
MSD2015 capped within each
domain
CuKeel Mar-2017 Main capped
at 9%, West capped at 5%, North
capped at 4.5%

uncapped;
search
restriction

uncapped; search
restriction > 11%
Zone 115; Zone
120 = 1.2%

Top cut 5.0%
Cu Top cut of 5.2% Cu

Capping
limit (Ag g/t)

MSD2011 uncapped; search
restriction
MSD2015 capped within each
domain
CuKeel Mar-2017 Main capped
at 38gpt, West capped at 30gpt,
North capped at 30gpt

uncapped;
search
restriction

uncapped; search
restriction > 50 g/t
Zone 115; Zone
120 = 15 g/t

Top cut 14
ppm Ag

25 g/t; search
restriction to 25 m

Capping
limit (Au g/t)

MSD2011 uncapped; search
restriction
MSD2015 capped within each
domain
CuKeel Mar-2017 Main capped
at 6 gpt, West capped at 2.8gpt,
North capped at 4gpt

uncapped;
search
restriction

uncapped; search
restriction > 5 g/t
Zone 115; Zone
120 = 2 g/t

Top cut 3.2
ppm Au

2.5 g/t; search
restriction to 25 m

X,Y,Z, block
size (m) 10mE x 10mN x 3mElev

10mE x
10mN x
3mElev

10mE x 10mN x
3mElev

20mE x
20mN x
3mElev

10mE x 10mN x
3mElev; reblocked
to 5x5x5

Sub-
blocking
(y/n) No, percent model

No, percent
model

No, percent
model

Yes, sub-
blocked
(Vulcan) No, percent model

Grade
interpolation
method

MSD2011 used OK - Cu, Au;
Inverse Distance squared - Ag
MSD2015 updates used OK -
Cu,Au; Inverse Distance squared
- Ag.
CuKeel Mar-2017 updates used

OK - Cu, Ag;
Inverse
Distance
squared- Ag OK OK

Inverse Distance
squared

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T-182

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