Beans: Determination of dockage


Dockage is assessed and recorded to the nearest 0.1%.

Dockage is defined under the Canada Grain Act as “any material intermixed with a parcel of grain, other than kernels of grain of a standard of quality fixed by or under this Act for a grade of that grain, that must and can be separated from the parcel of grain before that grade can be assigned to the grain”. Dockage is removed by following the cleaning procedures described in this chapter.

The sample as it arrives is referred to as the uncleaned or dirty sample. Its weight is the gross weight of the sample. Dockage is assessed on the gross weight of the sample.

Dockage not reported

Important: Dockage is not reported for

  • Beans, Sample Canada (class) Account Fireburnt
  • Beans, Sample Salvage
  • Beans, Sample Condemned
  • Unofficial samples declared as processed

Normal cleaning procedures

Important: Wear gloves and a mask to handle any samples that you suspect may contain hazardous substances.

  1. Using a Boerner-type divider, divide the uncleaned sample to obtain a representative portion.
    • Official samples shall be at least 1 kg.
    • Unofficial samples shall be at least 1 kg.
  2. Choose the appropriate hand sieve for the size of the bean.
    • number 8 slotted
    • number 9 slotted
    • number 11 slotted
  3. Sieve the samples over the appropriate slotted sieve, using approximately 250 g at a time, to remove all readily removable material.
  4. Handpick all coarse vegetable matter such as pods, stems, straw, thistle tops from the sieved sample.

    Important: Do not remove mineral matter, ergot, sclerotinia, weed seeds or other grains

  5. Handpick all grasshoppers, other insects and insect parts from the sieved sample.
  6. Handpick mudballs from the cleaned sample

Composition of dockage

  • All material, including splits, removed by sieving, handpicking or both, as defined in Normal cleaning procedures
  • Mudball beans handpicked from the cleaned sample

Commercially clean (CCLN)

Samples exiting primary elevators are considered commercially clean when they contain no dockage material.

Optional analysis

Where a shipper requests special cleaning of a carlot of grain at a terminal elevator, and the elevator manager agrees, dockage material will be analyzed for the presence of grain. The percentage and grade of any grain contained in the dockage will be reported.


  1. Analyze the official sample.
  2. Record the following on inspection records:
    • The percentage by gross weight to the nearest 0.1% and the grade of beans.
    • The percentage by gross weight to the nearest 0.1% and the grade of grain separable from dockage.
    • The percentage of dockage.


      • 95.0% Beans number 1 Canada Cranberry
      • 4.0% Domestic Mustard Seed, number 1 Canada Oriental
      • 1.0% dockage