I would be interested to see what you've read on this. From what I've read on cane sugar, pretty well all organic sugar is in fact 100% vegan.
"If a sugar is labeled organic, does that mean it’s not filtered with bone char?
Yes. Certified U.S. Department of Agriculture organic sugar cannot be filtered through bone char. If the sugar you want to buy isn’t organic, check to see if it says “unrefined” or if it’s made from beets. " Source
Furthermore, the following companies do not use bone-char filters:
In the Raw
Big Tree Farms
Bob’s Red Mill
In the Raw
Michigan Sugar Company
The Raw Cane
Simple Truth (Kroger/Ralphs’ brand of Organic Sugar)
Simply Balanced (Target’s brand of Organic Sugar)
Western Sugar Cooperative
In Canada - Rogers Sugar
– All products under the subsidiary Lantic and Taber trademarks are vegan
– Rogers sugar from Montreal and Alberta is vegan, but the Vancouver refinery uses bone char
– Rogers products with the code starting with the number “10” are from Vancouver, British Columbia
A lot of companies now state on their packaging if they're vegan. Nonetheless, there's a plethora of vegan choices, but personally, I use either organic coconut sugar, maple syrup, and sometimes agave.