Jervois Mining receives rock chip results from Kilembe Area, Uganda

Sample
Number

Type of Sample

Exploration
Licence

Cu-Au
Occurrence

Rock Type

Au g/t Au

Ag ppm

Co ppm

Cu ppm

Cu %

X564733

Rock Chip

EL1736

Eagle

Meta-Sediment

18.15

47.0

24

378,000

37.80

X564729

Rock Chip

EL1736

Senator

Meta-Sediment

16.30

0.7

20

36,300

3.63

X564730

Rock Chip; Duplicate

EL1736

Senator

Meta-Sediment

14.15

1.2

66

77,900

7.80

X569913

Rock Chip

EL1736

Senator

Meta-Sediment

12.80

0.6

130

17,950

1.80

X569941

Rock Chip

EL1736

Bond

Meta-Sediment

12.45

20.0

2

39,500

3.95

A0300332

Rock Chip

EL1736

Senator

Meta-Sediment

10.90

0.4

8

1,420

0.14

X564638

Rock Chip

EL1736

Senator

Meta-Sediment

10.45

0.6

157

3,500

0.35

A0300275

Rock Chip

EL1736

No Occur

Meta-Sediment

7.81

-

37

77

A0306906

Rock Chip

EL1736

Senator

Meta-Sediment

7.58

0.6

10

1,440

0.14

X564734

Rock Chip

EL1736

Eagle

Meta-Sediment

6.85

23.7

35

246,000

24.60

X569914

Rock Chip

EL1736

Senator

Meta-Sediment

6.75

0.6

18

2,750

0.27

X569912

Rock Chip

EL1736

Senator

Meta-Sediment

6.69

0.5

62

14,550

1.46

X564637

Rock Chip

EL1736

Senator

Meta-Sediment

6.61

0.5

19

1,450

0.14

X569936

Rock Chip

EL1736

Senator

Meta-Sediment

6.34

0.3

14

925

0.09

A0306902

Rock Chip

EL1736

Senator

Meta-Sediment

6.30

0.7

35

1,840

0.18

X569927

Rock Chip

EL1736

Senator

Meta-Sediment

6.20

0.4

33

1,260

0.12

X569934

Rock Chip

EL1736

Senator

Meta-Sediment

5.03

-

10

378

A0306907

Rock Chip

EL1736

Senator

Meta-Sediment

4.92

0.9

10

244

X569937

Rock Chip

EL1736

Senator

Meta-Sediment

4.91

0.3

10

3,900

0.39

A0300026

Rock Chip

EL1736

Bond

Meta-Sediment

4.27

-

4

54

A0300234

Rock Chip

EL1736

Bond

Meta-Sediment

4.05

0.4

2

911

0.09

X569918

Rock Chip

EL1736

Senator

Meta-Sediment

3.99

-

12

297

A0300270

Rock Chip; Duplicate

EL1736

Bond

Meta-Sediment

3.98

5.9

3

28,600

2.86

X569931

Rock Chip

EL1736

Senator

Meta-Sediment

3.78

0.5

18

586

X569924

Rock Chip

EL1736

Senator

Meta-Sediment

3.68

0.2

25

281

A0306909

Rock Chip

EL1736

Senator

Meta-Sediment

2.99

-

4

273

A0300333

Rock Chip

EL1736

Senator

Meta-Sediment

2.80

0.2

4

255

X564728

Rock Chip

EL1736

Senator

Meta-Sediment

2.67

0.2

39

5,950

0.60

X569919

Rock Chip

EL1736

Senator

Meta-Sediment

2.35

-

26

137

A0300303

Rock Chip

EL1736

Bond

Meta-Sediment

2.24

6.1

5

30,000

3.00

X569933

Rock Chip

EL1736

Senator

Meta-Sediment

2.21

0.3

3

250

X569921

Rock Chip

EL1736

Senator

Meta-Sediment

1.89

-

5

107

X564642

Rock Chip

EL1736

Eagle

Meta-Sediment

1.69

-

13

137

X569935

Rock Chip

EL1736

Senator

Meta-Sediment

1.64

0.3

3

224

A0306908

Rock Chip

EL1736

Senator

Meta-Sediment

1.58

0.4

7

58

A0306910

Rock Chip; Duplicate

EL1736

Senator

Meta-Sediment

1.47

-

4

280

A0300331

Rock Chip

EL1736

Senator

Meta-Sediment

1.23

-

8

67

A0300268

Rock Chip

EL1736

Bond

Meta-Sediment

1.20

13.8

2

70,700

7.10

A0300269

Rock Chip

EL1736

Bond

Meta-Sediment

0.99

5.2

4

35,200

3.52

A0300307

Rock Chip

EL1736

Bond

Meta-Sediment

0.95

0.3

7

299

X569923

Rock Chip

EL1736

Senator

Meta-Sediment

0.85

-

108

744

A0300301

Rock Chip

EL1736

Bond

Meta-Sediment

0.78

0.7

21

8,030

0.80

A0300302

Rock Chip

EL1736

Bond

Meta-Sediment

0.75

1.2

10

6,480

0.65

*

Rock chip samples are by their nature selective and are not necessarily indicative of the general geology or grade within the property. 

Criteria

JORC Code explanation

Commentary

Sampling techniques

•  Nature and quality of sampling (eg cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc). These examples should not be taken as limiting the broad meaning of sampling.

Sampling to date includes 807 diamond drill samples (from 9 diamond core drill holes); 17,798 soil samples; 2471 rock samples, 26 Heavy Mineral Concentrates; 25 stream silt samples; 1258 trench samples (rock); and, 379 trench samples (soil).

All drill core was generally sampled on 1m intervals, contingent on geology and core recovery:

Core was collected directly from the core barrel into core boxes, and Core samples were split in half, with the top half of the core analysed and other half retained as reference core in the tray. Core trays were clearly labelled with the hole number, tray number and metre intervals marked. Bottom-of-hole orientation line was marked prior to geological logging and sampling.

Soil samples (B Horizon) are collected using a pick and spade to dig small pits which are filled back in after the sample is collected.  The samples are collected in 4x6' kraft bags and closed/sealed with a zip tie.  All sample information is recorded on hand-held devices utilizing the Fulcrum App.  ALS Sample tag books are utilized for sample identifiers which are scanned and/or entered manually.  The sample identifier is written on the bag and a tag is placed in the bag.  Sample and site photos are recorded at every site.  Devices are downloaded daily are all information is stored to the cloud. 

Rock samples (typically grab samples) are collected using a rock hammer.  The samples are selective and are not necessarily indicative of mineralization.  The samples are collected in 12x20 plastic ore bags and closed/sealed with a zip tie.  All sample information is recorded on hand-held devices utilizing the Fulcrum App.  ALS Sample tag books are utilized for sample identifiers which are scanned and/or entered manually.  The sample identifier is written on the bag and a tag is placed in the bag.  Sample and site photos are recorded at every site.  Devices are downloaded daily are all information is stored to the cloud. 

Samples were cut along the orientation line before being correctly placed back into the tray. The half-core was sampled, ensuring that the same side is consistently sampled, and placed into sample bags labelled with the assigned sample number.  Orientation lines are determined using a Reflex ACTIII orientation tool.  Downhole measurements are recorded using a Reflex EZ-Gyro Kit at multiple intervals down each hole and always at the end of every hole. 

Field sampling followed Jervois protocols including industry standard quality control procedures. 

All samples were sent to ALS Chemex South Africa (Pty) Ltd., an independent and fully accredited laboratory in South Africa ("ALS") for analysis for gold multi-element Induction Coupled Plasma Spectroscopy ("ICP").  Jervois also has a regimented Quality Assurance, Quality Control ("QA/QC") programme where at least 10% duplicates and blanks are inserted into each sample shipment.

•  Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used.

Sample representativity is ensured by:

Diamond Core: For all drilling core was halved for sub?sampling with a diamond saw. Sample intervals range from 0.1 to 1 m in length, with majority of samples assayed over 1 m intervals.

Rock grab samples are by their nature selective and are not necessarily indicative of the general geology of the property.

Handheld XRF instruments were used to spot check rock grab and/or drill core for mineralization, however those results were not relied on.  All sample results reported on are from ALS Chemex South Africa (Pty) Ltd.  Drill holes were lined with PVC piping and in most holes, downhole Electromagnetics were completed after drilling was complete. 

•  Aspects of the determination of mineralisation that are Material to the Public Report.

•  In cases where 'industry standard' work has been done this would be relatively simple (eg 'reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay'). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (eg submarine nodules) may warrant disclosure of detailed information.

All of the drilling was diamond drill core (HQ/NQ).  Typically, drill core was sampled on nominal 1m half core samples.

All sample analyses were completed at ALS Chemex South Africa (Pty) Ltd. and/or ALS Chemex Vancouver, Canada.  ALS is a global independent laboratory which is ISO accredited.

Samples are received at the laboratory:  Bar codes are scanned and logged; samples are weighed and dried; samples are crushed and pulverized (-180 mesh soils; -75microns rocks) then riffle split; all samples are analyzed for 35 elements using ICP-AES and gold using 30 gram fire assay for soils and 50 gram Fire assay for rocks, both with an AA finish.  Any samples with over-limits specific to base metals or gold are re-analyzed.    

Drilling techniques

•  Drill type (eg core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc) and details (eg core diameter, triple or standard tube, depth of diamond tails, face-sampling bit or other type, whether core is oriented and if so, by what method, etc).

HQ casing/coring within saprolite yet the majority of the core was NQ

Holes were generally angled from 60 to 90 degrees at varying azimuths.

Reflex Orientation tool was used for structural orientations, and depths varied from 8.85m to 243m.

Drill sample recovery

•  Method of recording and assessing core and chip sample recoveries and results assessed.

•  Measures taken to maximise sample recovery and ensure representative nature of the samples.

•  Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material.

All holes are teched and all intervals are measured for recovery and RQD's are calculated.  Recovery % recorded in the geotechnical records as equivalent to the length of core recovered, as a percentage of the drill run.

Excellent recoveries were obtained from Diamond drilling.

There is no bias noted between sample recovery and grade. Excellent recoveries were obtained from Diamond drilling.

Logging

•  Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies.

•  Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc) photography.

•  The total length and percentage of the relevant intersections logged.

Diamond drilling:

Drill core is photographed and logged prior to sampling;

Core has been geologically and geotechnically logged to a level of detail appropriate to support mineral resource estimation and mining studies.

Logging has been conducted both qualitatively and quantitatively; full description of lithologies, alteration and comments are noted, as well as percentage estimates on veining and sulphides.

In total, 2027 m of diamond drill core have been completed.  All drill holes are logged in their entirety. 

Sub-sampling techniques and sample preparation

•  If core, whether cut or sawn and whether quarter, half or all core taken.

•  If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry.

•  For all sample types, the nature, quality and appropriateness of the sample preparation technique.

•  Quality control procedures adopted for all sub-sampling stages to maximise representivity of samples.

•  Measures taken to ensure that the sampling is representative of the in situ material collected, including for instance results for field duplicate/second-half sampling.

•  Whether sample sizes are appropriate to the grain size of the material being sampled.

Core was half-cut lengthwise using a diamond saw along the orientation line.  The half-core was sampled, generally on metre intervals.

Samples are received at the laboratory:  Bar codes are scanned and logged; samples are weighed and dried; samples are crushed and pulverized (-75 microns rocks) then riffle split;  all samples are analyzed for 35 elements using ICP-AES and gold using 50 gram Fire assay with an AA finish.  Any samples with over-limits specific to base metals or gold are re-analyzed.    

For core sampling the same side is consistently sampled, half-core with the bottom of hole line is retained in the tray. The assay sub- sample is placed into sample bags labelled with the assigned sample number.

One in 20 samples is duplicated where the core is quartered and a quarter cut sample is analysed as a duplicate.  The remaining quarter samples is retained in the tray.

Sample sizes of 2-3 kg are appropriate for the grain size of material. The sample preparation technique and sample sizes are considered appropriate to the material being sampled.

Quality of assay data and laboratory tests

•  The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total.

•  For geophysical tools, spectrometers, handheld XRF instruments, etc, the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc.

•  Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (ie lack of bias) and precision have been established.

The ICP-AES and Fire Assay (50 gram) are considered total and are high quality.

Jervois has a regimented Quality Control protocol which has consisted of systematic submission of blanks and duplicates in addition to those conducted at the laboratory. 

Precision levels for all blank and duplicate samples fell within acceptable ranges. 

Verification of sampling and assaying

•  The verification of significant intersections by either independent or alternative company personnel.

•  The use of twinned holes.

•  Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols.

•  Discuss any adjustment to assay data.

Since no significant intersections have been reported, independent verification has not yet been necessary.

No holes have been twinned.

Data is collected using a customized version of the Fulcrum app.  The data is backed up systematically on and off site as well as on the cloud. As well, data is recorded using a master Microsoft Office Excel spreadsheet and all location and assay data are compiled in a Microsoft Office Access database.

All data below detection limit have been entered as zero.

Samples received damaged at the laboratory, or with insufficient sample weight for analysis had the interval or location left blank, but in general were re-sampled and/or re-collected (specific to soils and rock grab samples). 

Location of data points

•  Accuracy and quality of surveys used to locate drill holes (collar and down-hole surveys), trenches, mine workings and other locations used in Mineral Resource estimation.

•  Specification of the grid system used.

•  Quality and adequacy of topographic control.

All collars were surveyed by trained surveyors using a Leica Differential GPS. Down-hole surveys were routinely carried out on all holes using a Reflex EZ-Gyro Kit.  Trenches and surface samples were recorded using handheld GPS.

All datum is collected and recorded in UTM WGS 1984.

The 3D location of the individual samples is considered to be adequately established, consistent with accepted industry standards.

Data spacing and distribution

•  Data spacing for reporting of Exploration Results.

Whether the data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied.

•  Whether sample compositing has been applied.

To date, due to the exploratory nature of the drilling, the spacing is highly variable.  Similarly, rock grab sample spacing is random.  Soil samples are collected in grids designed at varying spacings from >350m to 25m spaced samples.

To date all exploration is exploratory and data spacing would not be considered sufficient to establish a Mineral Resource or Ore Reserve Estimation.

Not applicable.

Orientation of data in relation to geological structure

•  Whether the orientation of sampling achieves unbiased sampling of possible structures and the extent to which this is known, considering the deposit type.

•  If the relationship between the drilling orientation and the orientation of key mineralised structures is considered to have introduced a sampling bias, this should be assessed and reported if material.

Drilling sections are orientated perpendicular to the strike of the host rocks.  Drill holes were inclined between 60° and 90° to optimize intercepts of mineralisation with respect to thickness and distribution.

Drilling with angled and vertical holes in most instances provides a representative sample across the stratigraphy.

Sample security

• The measures taken to ensure sample security.

All individual samples are bagged and sealed with a zip tie.  Then individual samples are bagged in poly woven sacks and sealed with coded security seals.  The laboratory reports all the security seals numbers to Jervois and any problems with the samples.  To date, no sample shipments have had reported problems and/or a breach in security. 

Audits or reviews

• The results of any audits or reviews of sampling techniques and data.

Jervois protocols consist of a regimented internal QA/QC which match or exceed global industry standards.  Thus far, due to the exploratory nature of the programme, no audits or external reviews have been conducted.