Table 2.

Regression equations and R² and P values for pre-1920 baselines metal-Al linear regressions for the Peace and Athabasca sectors. Statistically significant P values (at alpha = 0.05) are identified in italics

Sector	Metal	Regression equation	R2	P value
Peace	Be	y = 4.985 × 10−5x + 0.1244	0.88	< 2.2 × 10−16
	Cd	y = 3.242 × 10−5x + 0.1870	0.84	< 2.2 × 10−16
	Cr	y = 1.661 × 10−3x + 1.4117	0.99	< 2.2 × 10−16
	Cu	y = 1.579 × 10−3x + 8.2416	0.95	< 2.2 × 10−16
	Ni	y = 2.007 × 10−3x + 9.1078	0.87	< 2.2 × 10−16
	Pb	y = 6.660 × 10−4x + 4.5405	0.78	< 2.2 × 10−16
	V	y = 3.095 × 10−3x + 2.9212	0.95	< 2.2 × 10−16
	Zn	y = 6.823 × 10−3x + 19.3720	0.93	< 2.2 × 10−16
Athabasca	Be	y = 3.485 × 10−5x + 0.3024	0.52	< 1.8 × 10−11
	Cd	y = − 1.000 × 10−5x + 0.5025	0.04	0.129
	Cr	y = 1.387 × 10−3x + 3.2223	0.91	< 2.2 × 10−16
	Cu	y = 2.776 × 10−4x + 21.0130	0.04	0.129
	Ni	y = 6.217 × 10−4x + 16.9030	0.05	0.071
	Pb	y = 3.412 × 10−4x + 7.6384	0.28	7.22 × 10−06
	V	y = 2.352 × 10−3x + 6.1670	0.84	< 2.2 × 10−16
	Zn	y = 2.194 × 10−3x + 52.1310	0.22	1.06 × 10−4