Report on analytical results of bor

Report on analytical results of boreholes drilled July 2015 at FiCo sand deposit.

Tim Smith
26th October 2015

Summary
Conclusions
• Half the remaining FiCo reserve area has been drilled by a manual drilling method to 4.5m depth on a two holes per hectare basis as agreed between FiCo and NSG. The results show relatively consistent, coarse, low iron sand underlies all the tested reserve area.
• It is clear that the sample washing and processing method can significantly influence the iron level. The sample treatment at the NSG laboratory is likely to be less effective at removing iron minerals than the FiCo plant.
• This sand tested at Lathom appears broadly the same as that worked in previous years by FiCo although some individual boreholes (specifically 15/1 and 152) could indicate a relatively small zone of higher iron sand near the plant.
• However, taking into account the differences in iron reduction between the FiCo plant and the Lathom washing method, the evidence is that the basic quality of the raw sand in the area tested is not changing.
• FiCo can continue to supply sand conforming to a

Kết quả (Việt) 1:

Report on analytical results of boreholes drilled July 2015 at FiCo sand deposit.Tim Smith26th October 2015SummaryConclusions• Half the remaining FiCo reserve area has been drilled by a manual drilling method to 4.5m depth on a two holes per hectare basis as agreed between FiCo and NSG. The results show relatively consistent, coarse, low iron sand underlies all the tested reserve area. • It is clear that the sample washing and processing method can significantly influence the iron level. The sample treatment at the NSG laboratory is likely to be less effective at removing iron minerals than the FiCo plant.• This sand tested at Lathom appears broadly the same as that worked in previous years by FiCo although some individual boreholes (specifically 15/1 and 152) could indicate a relatively small zone of higher iron sand near the plant.• However, taking into account the differences in iron reduction between the FiCo plant and the Lathom washing method, the evidence is that the basic quality of the raw sand in the area tested is not changing.• FiCo can continue to supply sand conforming to a <100ppm specification.• No unexpected change in particle size distribution seems likely based on the samples tested.Recommendations• The results of this exercise should be used by VGI to demonstrate to FiCo that the remaining reserve can satisfy NSG requirements for iron level.• Để xác nhận rằng tất cả dự trữ còn lại là của chất lượng tương tự như một bài tập tương tự có thể được thực hiện trên khu vực dự trữ còn lại không được thử nghiệm vào tháng 7 năm 2015.Giới thiệu• Các khoản tiền gửi FiCo đã cung cấp VGI với sắt thấp cát kể từ khi khởi động vào năm 2012.• Với rất ít ngoại lệ cát đã được vận chuyển đầy đủ trong vòng VGI ưa thích các giới hạn tối đa 100ppm Fe2O3.• Nói chung giao hàng đã đáng kể dưới 80 trang/phút.• Mặc dù vậy, không có giới hạn tuyệt đối sắt đã bao giờ được đồng ý. FiCo đã không được chuẩn bị để chính thức đảm bảo việc giao hàng cát tại sắt cấp hoặc hạt kích thước phân phối theo yêu cầu của VGI.• TNHH tách lấy mẫu được thực hiện giữa phòng thí nghiệm VGI của NSG và độc lập Nha Trang viện (làm việc cho FiCo) trước đó vào năm 2015. Kết quả chỉ ra rằng bất kể phòng thí nghiệm đã thực hiện các thử nghiệm, phân tích sản phẩm cát bên trong giới hạn NSG ưa thích.• FiCo vẫn thiếu sự tự tin để đảm bảo chất lượng này và do đó, một thỏa thuận tạm thời được đặt chỗ bởi NSG để mua cát ở 150ppm Fe2O3 cho đến khi bổ sung nhàm chán và thử nghiệm của các khoản tiền gửi có thể diễn ra.• Báo cáo này bao gồm các kết quả phân tích từ các xét nghiệm sau đó.Vị trí giếng khoan và mẫu• Khoảng 16 ha đất tại Tây một nửa FiCo dự trữ vẫn còn unworked. Khu vực này hạn chế bởi quy hoạch và quyền sở hữu ranh giới về phía tây, bởi các hoạt động cũ ở phía đông và Nam nhưng vẫn mở về phía bắc.• The southern half of this remaining area was drilled by FiCo in cooperation with NSG at a borehole density of 2 per hectare.• Each borehole was drilled to a depth of 4.5m and supplied 3 samples from depths 0 – 1.5, 1.5 – 3.0 and 3.0 – 4.5m.• Each sample was split into two with one sample being sent to the Nha Trang Institute for independent testing on behalf of FiCo and the other being tested in NSG’s Lathom laboratory in the UK.• In total 48 samples were generated.Work carried out at Lathom• Lathom has an established Standard Operating Procedure for washing and preparing raw sands for analysis. However, this method is not applicable to small samples and is not designed to replicate the action of FiCo plant which relies on washing and spiral separation to remove fine particles and heavy mineral particles. It is these particles that are normally responsible for the majority of the iron in most Vietnamese sands.• The method adopted for samples from boreholes 15/1, 15/2 and 15/3 was to wash the sand using an automated sand washer and then collect an aliquot for XRF and particle size analysis from the washed moist sand.• However, during the washing of the first three boreholes it was suspected that heavy minerals were being lost due to heavy particles sinking to the bottom of the washing container and sticking to the moist surface. This would render the aliquot unrepresentative. • In order to determine the effect of this on the iron level, all three samples from borehole 15/4 were tested three ways:o Raw untreated sand.o Washed and wet sampled (with some losses of heavy minerals).o Washed and dried with full retention of all particles.• Results of iron testing are shown in the next section but they revealed that the wet sampling method did indeed lose some heavy minerals. However, being an accidental loss, it is likely that this method is less effective at removing heavy minerals than the spiral separators in the FiCo plant. Therefore, it is likely that iron reduction by the FiCo plant will be more effective and the iron level in these samples is likely to be higher than in equivalent sand processed through the FiCo plant.• It was decided to analyse both the wet sampled sand and the raw sand from the remaining samples so as to cover the range of possible iron values before and after processing on the FiCo plant.• In addition, a range of washed samples were tested for particle size distribution.