Here's another angle that shows the wheelbarrow better. Does it hold a petition? Clarification is invited! I'm not finding the date of creation of the memorial, nor the artist's name.
Images should link to their original pages.
If someone knows the story of the creation of the sculpture... Colleen Prieto found info! The sculptor was Margriet Windhausen. It was dedicated in 1993, and the wheelbarrow is full of a big petition with over 30,000 names.
The campaign produced three major petitions in 1891, 1892 and 1893. The 1893 petition with 31,872 signatures was the largest ever gathered in Australasia.