The name of the column in the block model.

How to aggregate the column values. Use Aggregation enum: - Aggregation.MASS_AVERAGE - Mass-weighted average (for grades) - Aggregation.SUM - Sum of values (for metal content)

Display label for the column in the report.

Unit ID for the output values. Use Units class constants: - Units.GRAMS_PER_TONNE - g/t (grades) - Units.PERCENT - % (grades) - Units.PPM - ppm (grades) - Units.KILOGRAMS - kg (metal content) - Units.TONNES - t (metal content) - Units.TROY_OUNCES - oz_tr (metal content)

Example: >>> from evo.blockmodels import Units >>> from evo.blockmodels.typed import Aggregation, ReportColumnSpec >>> >>> # For grade columns, use MASS_AVERAGE >>> grade_col = ReportColumnSpec( ... column_name="Au", ... aggregation=Aggregation.MASS_AVERAGE, ... label="Au Grade", ... output_unit_id=Units.GRAMS_PER_TONNE, ... ) >>> # For metal content columns, use SUM >>> metal_col = ReportColumnSpec( ... column_name="Au_metal", ... aggregation=Aggregation.SUM, ... label="Au Metal", ... output_unit_id=Units.KILOGRAMS, ... )