In a company blog post today, Mackenzie admitted it was a difficult goal, but it would make BHP a better business.
When BHP set the target in 2016, its workforce comprised 17.6% women or one in six employees.
The company has employed 2070 women since the start of the 2017 financial year, including 1156 women in FY19.
It has lifted the proportion of women in BHP's workforce to 24.5%, or one in four employees.
The proportion of females to males employed by BHP was 37.7% in FY19, but voluntary turnover of women remains higher than men, at 6.2% versus 4.9%, though the gap has been more than halved in the past financial year.
BHP's data shows its most inclusive and diverse teams had a 67% lower total recordable injury frequency rate, a 21% greater sense of pride in working for BHP, were up to 11% more productive, and were 68% more likely to speak up and share ideas.
"What we have learnt over the past three years has not only reinforced our commitment with solid data, it has intensified our resolve to get there," Mackenzie said.
"We still have a long way to go to achieve our goal, and we are determined to maintain momentum.
"This transformation of our workforce will deliver value for BHP over the long-term."