Blackheath Resources Inc.
HomeContact
TSX: BHR
$0.05

Projects

Show printable version of 'Bejanca Project ' item in a New Window

Bejanca Project

The Bejanca concession is located in north central Portugal, 12 km northwest of the city of Viseu and covers an area of 89 square kilometres. The mines at Bejanca operated from the early 1900's until 1985, when low tungsten prices resulted in their closure. Mining was from several shallow open pits and shallow underground workings. The tungsten and tin mineralisation occurs in stockworks in greisens and also in hydrothermal quartz veins in granites.

There are at least seven known historic mine workings and showings surrounding the main historic Bejanca mine within the project area. Our initial sampling program focused on preliminary mapping and sampling of these surrounding historic mines and workings.

Assays of selected grab samples from these areas included the following:
  • 2.12% WO3 at Vale da Fonte
  • 1.68% WO3 at Mina de Masgalos
  • 1.00% WO3 at Mina da Bodiosa
  • 0.85% WO3 at Mina de Vale Gouro
The above samples were taken at a minimum distance of one kilometre from each other. In addition, a 3.4 kilogram sample of slag from the small waste dump adjacent to the historic ferro-tungsten smelter at Mina de Vale Gouro was selected and assayed 17.85% WO3. The quantity of this material is unknown. (These must be considered to be preliminary selected samples, and as such, may not be representative of average values for each showing.)

During the preliminary work program at Bejanca, Blackheath reviewed a historic economic assessment and resource estimate authored by Edward D. Lynton, Consulting Mining Engineer of Glendale, California, in July of 1953 for the Companhia Portuguesa de Minas. Included in the report was a historic resource estimate of the alluvial and eluvial sand areas at Bejanca and nearby Espirito Santo which showed 6,700,000 tonnes with estimated recoverable values of 16,231 tonnes of cassiterite (tin mineral) concentrate containing some 12,660 tonnes of tin and 3,289 tonnes of wolframite (tungsten mineral) concentrate containing some 2,460 tonnes of tungsten trioxide (WO3). The price of tin is currently approximately $21,000 per tonne and the price of tungsten is approximately $39,000 per tonne of contained tungsten trioxide (WO3). (These resource estimates are not intended to represent current compliant resource, are historic in nature and have not been verified by the Company or its consultants but are believed to be relevant and informative although not compliant with current NI43-101 standards and should not be relied upon.)

The following table shows the historical resources as estimated by Lynton. These historical resources are partially covered by sands produced by the treatment of the mineralized greisen at the nearby Bejanca open pit mine, and have also been partially mined by artisanal miners in the past at a small scale but to an unknown extent.

  Estimated Resource Recovered
Cassiterite
Recovered
Wolframite
Cassiterite Wolframite
Area Tonnes kg/ tonne kg/ tonne Tonnes Tonnes
Bejanca 4,000,000 2.396 0.324 9,584 1,296
Espritu Santo 2,700,000 2.462 0.738 6,647 1,993
Totals 6,700,000 2.435 0.491 16,231 3,289


Source: Preliminary Report on the Couto Mineiro da Bejanca, Viseu, Portugal by Edward D. Lynton, Consulting Mining Engineer, Glendale, California dated July 7, 1953

Note: These resource estimates are historical in nature, are not intended to represent current resources, and have not been verified by the Company or its consultants but are believed to be relevant and informative although not compliant with current NI 43-101 standards and should not be relied upon. The estimates by Lynton (1953) were completed by standard methods by measuring the thickness of the alluvium in several pits and obtaining a measure weighted quantity of alluvium to determine the dry weight per tonne. To obtain the recoverable grade, seven large samples were taken over the area and the weighed dry samples run over a table. The density of the material was measured from volumes and weights of material from the pits corrected for moisture content and the concentrates recovered from each batch of samples were weighed after separating the cassiterite and wolframite magnetically. This is the only known historical resource estimate and does not fall into any current NI 43-101 resource estimate category.

Blackheath is planning an auger or back-hoe sampling programme in 2014 to re-assess the alluvial and eluvial material at Bejanca as well as further exploration of the hardrock and vein potential.

The Bejanca property has been optioned to Blackheath through an agreement to earn a 100% interest with a private company, Mineralia - Minas, Geotecnia e Construcoes, Lda., which holds the property through an exploration concession granted by the Government of Portugal. The project area covers 89 square kilometres and is granted for an initial period of two years renewable for a further three years in one year increments, after which it may be converted into a preliminary exploitation licence and a final exploitation licence successively. Under the letter of intent, Blackheath will undertake to fulfill the terms of the concession, including staged minimum exploration expenditures of €650,000 over five years, and to pay Mineralia €25,000 upon execution of a definitive agreement, a further €100,000 upon the grant of a preliminary exploitation licence and a further €1 million upon mine production and the grant of a final exploitation licence.

Location of Bejanca Test-Mining Pits


Pit Bedrock (m) Grade (ppm SnO2) Grade (ppm WO3)
1 5.50 824 249
2 3.90 2614 1086
3 0.50 998 34
4 0.50 607 893
5 3.90 490 30
6 2.50 979 247
7 1.70 96 14
8 0.75 621 20
9 3.70 256 15
10 1.40 248 20
11 1.00 295 20
12 2.90 838 23
13 2.50 1230 183
14 2.90 785 73
15 2.70 422 71
16 1.90 1061 28
17 2.70 178 13
18 2.90 147 20
19 3.90 191 18
20 1.80 277 36
21 2.30 915 113
22 0.90 231 16
23 2.90 221 13
24 2.30 795 43
25 2.90 731 250
26 1.40 369 12
27 0.70 445 33
28 1.90 321 34
29 2.90 425 30
30 2.90 843 157
31 2.70 349 18
32 0.80 204 16
33 2.80 1003 24
34 2.80 61 14
35 2.70 343 21
36 3.60 1077 183
37 1.20 169 10
38 1.80 1117 1228
39 3.80 352 25
40 2.40 162 11
41 2.70 1294 743
42 1.80 110 21
43 3.80 659 52
44 1.80 275 18
45 1.90 1750 65
46 1.90 334 15
47 2.90 877 719
48 2.60 1653 78
49 0.90 275 188
50 2.60 409 308
51 0.80 247 22
52 1.60 176 16
53 2.90 510 126
54 3.90 156 27
55 3.60 259 76
56 0.80 294 60
57 2.80 240 27
58 2.80 746 127
59 0.80 386 52
60 1.40 456 49
61 2.90 227 37
62 2.90 394 39
63 1.80 152 20
64 2.30 134 17
65 2.90 196 12
66 1.70 424 357
67 3.60 196 13
68 2.90 87 13
69 2.90 436 32
70 3.60 106 15
71 1.50 130 22
72 2.60 507 1203
       
Average Bedrock (m) grade (ppm SnO2) grade (ppm WO3)
2.38 519 138

Pit samples were taken immediately below the soil horizon at 1.0 metre intervals until reaching bedrock. Samples were screened and assayed by ALS Minerals, an accredited laboratory using standard procedures.